Comparison of online backup services

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This is a comparison of online backup services.

Online backup is a particular kind of file hosting service; however, various products that are designed for file storage may not have features or characteristics that others designed for backup have.

Comparison[edit]

Provider Win.1 Linux1 Mac1 Android1 iOS1 Encrypted storage Zero knowledge2 Secure Key Management3[1] Limited MB plan4 Unlimited MB plan4 $/MB plan4 Unlimited BW 17 Provider Cloud hosted Net Drive5 P2P6 Sync7 Autodetect changes12 Public file hosting8 physical media restore9 Server location(s)10 Free online storage (non-trial)13 Maximum per-file size External hard drive support14 Hybrid Option15 Green Hosting ITAR Compliant
Acronis Yes Yes Yes Yes Yes Yes No Yes No Yes No Yes Acronis No No Yes  United States,  Europe No No limit Yes No
ASUS WebStorage Yes Yes (only 32 bit) Yes Yes Yes Yes No ? Yes No Yes ASUS WebStorage No Yes Yes Yes Yes  United States, ASIA 5 GB 500 MB (Free) 10GB (Paid) Yes No
Backblaze Yes No Yes Yes Yes Yes[2] Optional[2] But company must be given passphrase (to private key) to restore any data. ? No Yes No Yes Backblaze No Yes No Yes  United States No No limit Yes No No
Barracuda Backup Service Yes Yes Yes Yes[3] No ? No fee per computer No Yes Barracuda Backup Service Yes[citation needed] No Yes No Yes  United States, APAC,  Europe No ? No
Bitcasa Yes[4] Yes Yes (Only 64-bit) Yes Yes Yes Bitcasa cannot decrypt data, but uses convergent encryption15 [5] ? Yes No No Yes Bitcasa Yes[6] No Yes Yes Yes Yes  United States 5 GB[7] No limit[8] No[9] No, Amazon AWS[10][11] No
Box Yes Partial (no offline sync, access through DAV server)[12][13] Yes Yes Yes Yes[14] No[14] ? Yes Yes Box Yes[15] Yes[16] Yes  United States 10 GB 250 MB (Free) 5 GB (Paid) No
BullGuard Backup Yes No No Yes Yes Yes[17] Yes Yes Yes Yes BullGuard Backup Yes[citation needed] No Yes Yes  Europe No  ? No
Carbonite Yes No Yes Yes Yes Yes Yes for Windows only[18] ? Yes (Business only) Yes (Home only) No[19] Yes [20] Carbonite Yes Yes Yes[21]  United States No 4 GB Yes[22] Yes No
Provider Win.1 Linux1 Mac1 Android1 iOS1 Encrypted storage Zero knowledge2 Secure Key Management3 Limited MB plan4 Unlimited MB plan4 $/MB plan4 Unlimited BW 17 Provider Cloud hosted Net Drive5 P2P6 Sync7 Autodetect changes12 Public file hosting8 physical media restore9 Server location10 Free online storage (non-trial)13 Maximum per-file size External hard drive support14 Hybrid Option15 Green Hosting ITAR Compliant
CloudBerry Lab Yes Yes Yes No No Yes Yes Yes Yes CloudBerry Lab Yes No Yes Yes Yes Global No No limit Yes Yes No
CloudMe Yes Yes Yes Yes Yes No, but 3rd party apps available[citation needed] ? No Yes CloudMe Yes[23] Yes Yes Yes  Sweden 3 GB 150 MB (Free Accounts) No limit (Premium Accounts) No Limit No No
Comodo Backup Yes No No Yes[24] No ? Yes No Yes (5) Comodo Backup No No No No  United States No No
CrashPlan Yes Yes Yes Yes Yes Yes[25] Yes, except for web restore[26] Yes Optional Yes Yes Yes[27] Crashplan No Optional No Yes[28] No Yes  United States,  Australia[29] No No Limit Yes[30] No No
Cubby Yes No Yes Yes Yes Yes No ? Yes No No Yes Cubby Yes[31] Yes Yes (DirectSync) Yes Yes Yes  United States,  Europe 5 GB with friend referrals up to 25 GB 2 GB (Web Interface) No limit (Desktop client) Yes  ?  ? No
Datto Yes Yes Yes Yes Yes, key must be provided for cloud virtualization Datto Yes Yes  United States (bi-coastal)
Diino Yes Yes Yes No[32] No ? Optional Yes Optional Yes Diino Optional Yes Yes No No limit  ? No
Dropbox Yes Yes Yes Yes Yes Yes No,[33] but 3rd party apps available[34] ? Yes Dropbox No No Yes Yes Yes  United States 2 GB 300 MB (Web Interface) No limit (Desktop client) No No Was Amazon AWS, but references removed from FAQ. No
Dropmysite Yes Yes Yes Yes No ? Yes Optional No Yes Dropmysite Yes Yes Yes Global 2 GB No limit ? No
Provider Win.1 Linux1 Mac1 Android1 iOS1 Encrypted storage Zero knowledge2 Secure Key Management3 Limited MB plan4 Unlimited MB plan4 $/MB plan4 Unlimited BW 17 Provider Cloud hosted Net Drive5 P2P6 Sync7 Autodetect changes12 Public file hosting8 physical media restore9 Server location10 Free online storage (non-trial)13 Maximum per-file size External hard drive support14 Hybrid Option15 Green Hosting ITAR Compliant
Druva Insync Yes Yes Yes Yes Yes Yes[35] Optional[35] ? Yes[35] Yes[35] No Yes Druva Insync Yes Yes Yes  United States,  United Kingdom,  Japan,  Brazil,  Singapore,  Australia [35] No No limit Yes Yes
Egnyte Yes Yes Yes Optional[36] Optional[36] ? Egnyte Yes[37] No Yes Yes Yes  United States No No limit  ? No
ElephantDrive Yes Yes[38] Yes Yes[39] Yes Optional (off by default) [40] ? Yes No ElephantDrive Yes[41] Yes[42] Yes Yes[43]  United States 2 GB Yes  ? No, Amazon AWS[11][44] No
EVault Yes Yes Yes Yes[citation needed] ? No No Yes Yes EVault Yes[citation needed] No No Yes Yes  United States,  United Kingdom,  Canada,  Ireland No No limit Yes Yes No
FilesAnywhere Yes Partial Yes Yes, via Storage Made Easy client Yes, via Storage Made Easy client Optional[45] No[46] ? Yes No Yes Yes FilesAnywhere Yes[47] No Yes Yes Yes Yes  United States 1 GB No limit Yes No
Google Drive Yes No, but there are third party clients in the List of backup software like Duplicati, etc. The client grive is not in the list. Official support is planned since April 2012.[48][49][50] Yes Yes Yes Yes No, available with third-party clients, such as Duplicati ? Yes, w/5+ users on Google Apps for work + unlimited or Business or Education [51] Yes Yes Google Drive No No Yes Yes Yes  United States, Worldwide 15 GB 5 TB[52] Partial: 34%[53] No
Handy Backup Yes Yes No Yes Yes Yes ? Yes Yes Yes Yes Handy Backup No No Yes Yes No Yes  United States,  Canada No[54] No limit Yes Yes No
Provider Win.1 Linux1 Mac1 Android1 iOS1 Encrypted storage Zero knowledge2 Secure Key Management3 Limited MB plan4 Unlimited MB plan4 $/MB plan4 Unlimited BW 17 Provider Cloud hosted Net Drive5 P2P6 Sync7 Autodetect changes12 Public file hosting8 physical media restore9 Server location10 Free online storage (non-trial)13 Maximum per-file size External hard drive support14 Hybrid Option15 Green Hosting ITAR Compliant
Trend Micro SafeSync Yes Partial Yes Yes, via Storage Made Easy client Yes, via Storage Made Easy client No ? Yes Trend Micro SafeSync Yes[citation needed] Yes Yes  United Kingdom No
IASO Backup Yes Yes Yes Yes[55] Yes[55] Yes ? Yes Yes Yes IASO Backup No No No No Yes  United States, Worldwide No No limit Yes Yes No
ICFiles Yes No No No No Yes Hardcoded One Way Encrypt Yes No Yes Yes ICFiles No No No Sync is Vulnerable to Cryptolock, ICF Express has Auto Upload Yes No  United States clients of clients .com 4 GBs-Desk App No Limit No IBM SOC2 IBM SOC2
iCloud Yes Yes, via Storage Made Easy client Yes Yes, via Storage Made Easy client Yes Yes No ? ? ? iCloud ? ? ? ? unknown ? Yes, 94%[11] No
Infinit Yes Yes Yes Yes[56] Optional[56] ? No Yes No Yes Infinit Yes Yes Yes Yes No limit Yes Yes No
Infrascale Yes Yes Yes Yes Yes Yes Optional Optional Yes Yes No Yes Infrascale No No Yes Yes Yes Yes  United States,  Canada,  United Kingdom,  South Africa,  Australia,  New Zealand,  Jamaica No No limit Yes Optional No
Iperius Online Storage Yes No No Yes[57] Optional[57] ? 50, 100, 200, 500 GB No No Yes Iperius Online Storage No Yes Yes No Iperius Online Storage No limit No
Intronis Yes No Yes Yes Yes Yes Yes configurable Yes No[58] Yes Yes Intronis Yes No Yes[59] Yes No Yes[60]  United States,  Canada No No limit Yes Optional Yes No
Jumpshare Yes No Yes No No Yes[61] Yes No No Yes[62] Jumpshare No Yes Yes Yes No  United States,  Europe 2 GB 250 MB on free, Unlimited on Jumpshare Plus Yes No
Provider Win.1 Linux1 Mac1 Android1 iOS1 Encrypted storage Zero knowledge2 Secure Key Management3 Limited MB plan4 Unlimited MB plan4 $/MB plan4 Unlimited BW 17 Provider Cloud hosted Net Drive5 P2P6 Sync7 Autodetect changes12 Public file hosting8 Physical media restore9 Server location10 Free online storage (non-trial)13 Maximum per-file size External hard drive support14 Hybrid Option15 Green Hosting ITAR Compliant
Jungle Disk Yes Yes Yes Yes Yes Yes[63] Yes[63] Yes Yes Yes Jungle Disk Yes[64] No Yes Yes Yes  United States,  Europe No No limit in Backup Vault Yes Partial, Amazon AWS[11][65] or Rackspace Cloud Files. No
KeepVault Yes No No Yes[66] Yes[67]  ? Yes No Yes KeepVault Yes  United States 20 GB No
KineticD Yes No Yes Yes Yes Yes No  ? No Yes Yes Yes KineticD Yes[citation needed] No No Yes Yes Yes  Canada No No limit Yes Yes
Livedrive Yes No Yes Yes Yes No No  ? Yes Online Backup only No Yes Livedrive Yes (paid-only)[68] No Yes Yes Yes Yes  United Kingdom No No limit Yes No
MediaFire Yes Upload only [3] Yes Yes Yes No No  ? Yes No Yes Yes MediaFire No No Yes Yes Yes  United States 10 GB No Limit No No No
MEGA Yes Yes Yes Yes Yes Yes Yes Yes[69] Yes No Yes Yes MEGA No No Yes Yes, using MEGAsync client Yes No  Europe,  New Zealand 50 GB No limit No No No
Memopal Yes Yes Yes Yes Yes Yes[70] No[71]  ? Yes Memopal Yes Yes Yes  United States,  Europe, Asia 3 GB 5 GB No
MiMedia Yes No No Yes[72] No  ? Yes No Yes Yes MiMedia Yes[citation needed] No No Yes No No  United States 7 GB 3 GB Yes No
Mozy Yes Yes Yes Yes Yes Yes[73] Optional[73]  ? Yes No Mozy No Yes Yes Yes  United States,  Europe 2 GB No limit [74] Yes No No
OneDrive Yes No, see note[75] Yes Yes[76] Yes No[77] No  ? Yes No OneDrive No Yes 5 GB for new users, 25 GB for older users 10 GB Partial, 29%[11] No
OwnDrive Yes Yes Yes Yes Yes Yes Yes  ? OwnDrive Yes Yes 1 GB No
SpiderOak Yes Yes Yes No, the android client is only capable of accessing spideroak cloud data Yes Yes[78] Yes[78]  ? Yes Yes, Occasional offers for unlimited Yes Yes SpiderOak No[79] No Yes Yes Yes (2 GB free for 60 days only No limit Yes Yes[80] No
Provider Win.1 Linux1 Mac1 Android1 iOS1 Encrypted storage Zero knowledge2 Secure Key Management3 Limited MB plan4 Unlimited MB plan4 $/MB plan4 Unlimited BW 17 Provider Cloud hosted Net Drive5 P2P6 Sync7 Autodetect changes12 Public file hosting8 physical media restore9 Server location10 Free online storage (non-trial)13 Maximum per-file size External hard drive support14 Hybrid Option15 Green Hosting ITAR Compliant
SugarSync Yes No Yes Yes Yes Yes[81] No[82]  ? Yes No No SugarSync Yes Yes Yes (SugarSync account needed for folders) No 100 MB (web) No limit (client app)[83] No
Syncplicity Yes No Yes Yes[84] No[84]  ? Yes Syncplicity Yes Yes  United States 2 GB No
Tarsnap Using Cygwin Yes Yes No No Yes Yes[85]  ? No No Yes Tarsnap No No No No, Amazon AWS[11][86] No
TeamDrive Yes Yes Yes Yes Yes Yes Yes  ? Yes Yes, via self-hosting No Yes TeamDrive Yes{{[87]}} No Yes Yes Yes No  United States,  Germany,  Ireland,  Hong Kong 2 GB No limit Yes No, Amazon AWS by default[11][88] No
Tresorit Yes Yes[89] Yes Yes Yes Yes Yes  ? Yes No Yes Yes Tresorit No No Yes Yes Yes No  Europe[90] 3 GB 0.5 GB (free), 10 GB (paid)[91] Yes No No
Unitrends Vault2Cloud Yes Yes Yes Yes[92] No  ? No Yes Yes Unitrends Vault2Cloud Yes[citation needed] No Yes No Yes  United States No No
UpdateStar Online Backup Yes No No Yes[93] No[94]  ? Yes[95] Yes UpdateStar Online Backup  Europe No
Vembu OnlineBackup Yes Yes Yes Yes Yes Yes Yes Yes Yes Vembu OnlineBackup No No Yes Yes  United States, APAC, Europe Yes Yes Yes Yes No No
Yandex.Disk Yes Yes[96] Yes Yes Yes No[97] No  ? Yes Yandex.Disk Yes[98] No Yes Yes 10 GB 10 GB No
Zetta.net Yes[99] Yes Yes Yes No  ? Yes No Yes[100] Yes Zetta.net Yes[101] No Yes Yes No Yes  United States[102] No No limit Yes Yes Yes
Zmanda Cloud Backup Yes No No Optional[103] Optional[103]  ? Yes Zmanda Cloud Backup Yes[citation needed] Yes  United States,  Europe,  Singapore,  Japan No limit Yes Yes Partial, Amazon AWS or Google Cloud Storage[11][104] No
Provider Win.1 Linux1 Mac1 Android1 iOS1 Encrypted storage Zero knowledge2 Secure Key Management3 Limited MB plan4 Unlimited MB plan4 $/MB plan4 Unlimited BW 17 Provider Cloud hosted Net Drive5 P2P6 Sync7 Autodetect changes12 Public file hosting8 physical media restore9 Server location10 Free online storage (non-trial)13 Maximum per-file size External hard drive support14 Hybrid Option15 Green Hosting ITAR Compliant

Legend[edit]

  • ^1 Windows/Linux/Mac/iOS/Android/BlackBerry - Supported operating systems for thick client (native binary application), which provide background data transmission and setting services.
  • ^2 Zero knowledge - The user needs to manage their own encryption key or password. If they lose it, there is no way to access the data. The service provider cannot access the user's data even if required by the government.[105][106] Backup service providers often claim that no one can access the users data even though they themselves could if forced to do so, so entries claiming support of this feature should always have a supporting reference. If the backup service has a password recovery or reset mechanism that allows a user to access their data when they lose their password or key, that proves they do not have zero knowledge.[107]
  • ^3 Secure Key Management - If yes, the user holds and controls of the encryption key. If no, the service provider holds and controls the encryption key.
  • ^4 Payment options/plans:
    • Limited MB plan - Pay per computer. Additional fee for storage over a threshold.
    • Unlimited MB plan - Pay per computer. Storage per computer is unlimited.
    • $/MB plan - Pay per unit of storage, but unlimited computers may share that storage.
  • ^5 Cloud hosted Net Drive - Cloud can serve storage over WebDAV, SMB/CIFS, NFS, AFP or other NAS protocol, allowing files to be streamed from the cloud. A change made to the cloud is immediately accessible to applications on all clients without needing to pre-download (sync) the file in full.
  • ^6 P2P storage - data spread over many computers based on peer-to-peer net advantages.
  • ^7 Sync - Synchronization between computers, and/or mobile devices (PDA, MDA,...)
  • ^8 Public Internet file hosting -
  • ^9 Restore via physical media -
  • ^10 Server location - countries where physical servers are located. Where the data will be located.
  • ^11 Still in Beta version
  • ^12 Whether the desktop client (if available) can detect and upload changes without scanning all files.
  • ^13 Many backup services offer a limited free plan, often for personal use. Often it is possible to increase the free backup limit through coupons, referrals, or other means that are not included in this column. This column also does not include free trials that are only available for a limited period of time.
  • ^14 External hard drive support - Can refer to an alternate backup destination or whether the service can back up external drives.
  • ^15 Hybrid Online Backup works by storing data to local disk so that the backup can be captured at high speed, and then either the backup software or a D2D2C (Disk to Disk to Cloud) appliance encrypts and transmits data to a service provider. Recent backups are retained locally, to speed data recovery operations.
  • ^16 Bitcasa encrypts each file with a key derived from that file, so a file can be decrypted only if you already have (or have had) the decrypted version. Therefore, bitcasa cannot decrypt arbitrary files, but they could e.g. remove a specific requested file or log which users access a specific requested file. There also is a learn-the-remaining-information attack possible.[108][109]
  • ^17 Unlimited BW - If bandwidth capping or limits are used on accounts.

Comments[edit]

Acronis
Up to five PCs, always incremental backups, remote access from the web
AltDrive
Data de-duplication; block-level incremental; unlimited offering. Home (1–3 computers) or biz service (1–1000 computers). Client-side encryption, external USB drives, NAS support for Biz customers.
ASUS WebStorage
Auto-upload on designated folder, auto-backup capabilities, cross-platform file access of upload and sharing - iOS, Android, Windows Marketplace, OS X, Ubuntu, Linux, Windows Store (Windows 8) also any compatible browser. 5 GB of free data. Upload limit for each file of 500 MB on free account. Daily file sharing limit of 500 MB on free account. Free account will only allow one computer to be able to back up.
Backblaze
Data de-duplication; block-level incremental
Barracuda Backup Service
Data de-duplication; real-time hybrid on-site/off-site data back-up
blaucloud  
No User Limit each User get his ownCloud Instance in an encrypted Storage.
BullGuard Backup
5 PC/license, fast upload speeds, mobile access, encrypted transfer and storage, password-protected settings, free 24/7 support
Carbonite
Block-level incremental, Home or Pro editions. iPhone/ Blackberry/ Android App available to remotely access data from the online backup (For Pro: Users of the computer which are backed up, not available for the Administrator of the Pro). Can manually select files to upload that are larger than 4 GB.
Crashplan
Unlimited destinations. Data de-duplication; block-level incremental. Can run server-free, exchanging backup space with friends and family.
Datashield  
High-level encryption, personalized encryption key, shared cloud drive, sync folder functionality
Datto
Focused on business continuity and total data protection for small and medium businesses. Offers instant virtualization of backed up instances locally or securely in the cloud. Datto maintains it's own private cloud with 250+PB of protected data in 9 data-centers.
Dolly Drive
Cloud storage that is specifically designed for the Mac. Also allows users to store files exclusively in the cloud for seamless access on any computer or mobile device.
Diino
iPhone/Android app available.
Dropbox
Data de-duplication, delta sync, iPhone/Android/Blackberry app available.
Dropmysite
website backup, database backup, SFTP support, free up to 2 GB.
Druva inSync
Integrated Backup and File-sharing. HIPAA and ISAE3400 compliant
Egnyte
Delta sync, Google Docs sync, user and group management
ElephantDrive
Auto-transfer from defunct Xdrive.
FilesAnywhere
Mark Cuban acquired minority interest in 2006. Android, iOS, BlackBerry apps available. Dedicated server options available. CoolBackup software used for backup and sync.
F-Secure
[Steek acquired by F-Secure July 2009]
Humyo
Humyo was acquired by Trend Micro and will become part of Trend Micro SafeSync. Humyo no longer accepts new clients.
IASO Backup
Advanced[clarification needed] data reduction technology. Data de-duplication mechanism. High level[clarification needed] of scalability and cost effectiveness.
ICFiles
Secure File Share Storage. Proprietary license download client. High level security, SOC 2 TYPE II, ISO 27001,27017, 27018, CSA, PCI, HIPAA, CJIS, EU Model Clauses, on request private servers for FISMA and FedRAMP.
IDrive
Proprietary license download client. Automatic Selection. Continuous Data Protection. "Virtual drive" explorer.
Jungle Disk
Proprietary license download client sample code.
KeepVault
Real-time hybrid on-site and offsite data backup
Memopal
Cross-user de-duplication, delta sync
MiMedia
Initial seed via a MiMedia-owned external hard drive available (no extra cost, shipping included).
Mozy
Data de-duplication; block-level incremental. "Mozy Data Shuttle" physical seeding service available for extra fee.
Replicalia
Professional Backup for Professional Data
pCloud
Data de-duplication. Zero Knowledge Privacy with client-side encryption.
SpiderOak
Data de-duplication."Zero Knowledge" encryption.
StoreGrid Cloud  
Byte-level incremental backup, local backup, Disk Image backup - BMR and physical seeding.
Syncplicity
Google Docs sync, Central Management with Business Console
TaniBackup (Cheap Backup) 
Up to 10 TB per standard package. Extensible to over 300 TB per single account. Access via SMB/CIFS or SSH (including sftp, scp, rsync and so on). 100 GB for $2 per month.
Tarsnap
Client source available; data de-duplication; block-level incremental.
TeamDrive  
Store encrypted data on any WebDAV server; supports working offline; files can be commented; built-in support for conflict resolution.
Tencent Cloud (English)
Tencent is offering users 10TB of free cloud storage[110]
Unitrends Vault2Cloud
Data de-duplication; hybrid on- and off-premises data backup; physical seeding
UpdateStar Online Backup
Data de-duplication; block-level incremental
Usenet backup
Is the method of storing backup data on the usenet.[111]
Windows Live Mesh
Replaces windows live sync and windows live folder
Zetta Enterprise-grade Online Backup
Supports Linux, Mac OS, and Windows, high speed WAN optimization, SAS 70 certified data centers
Zmanda Cloud Backup
Available in German and Japanese languages, supports MS SQL Server, MS Exchange, SharePoint, MySQL Database, System State, Oracle

Versioning[edit]

Any changes can be undone, and files can be undeleted.

Acronis
Supports detailed history of changes to files with browsing by date or version number.
AltDrive
Old versions of files are kept for 60 days. Biz customers choose their retention policy of 30 days to 7 years to forever.
Backblaze
Old versions of files are kept for 30 days.
blaucloud  
Keeps old version if vesioning app is activated (included in all plans even FREE) until users runs out of storage.
Box  
Versioning is included in paid subscription
Carbonite
Keeps old versions for up to three months. It keeps one version for each day of the past week, one version for each of the previous three weeks, and one version for each of the previous two months that the file has been backed up. Versioning available for PC computers only; not available for Mac.
Crashplan
Options: All, or staged (daily, then weekly, etc.).
Cubby  
All previous versions and deleted files are kept until explicitly removed by the user or the user runs out of space. All deleted files and previous versions count towards the storage limit.
Dolly Drive
Yes. Keeps unlimited versions of files.
Dropbox
By default, Dropbox saves a history of all deleted and earlier versions of files for 30 days for all Dropbox accounts.[112]
Dropmysite
Provides incremental backups with the ability to download every snapshot.
Druva inSync  
Unlimited, Timeline based restores
ElephantDrive 
Any number of versions can be kept for any amount of time.
Google Drive
Old versions of files are kept for 30 days or 100 revisions. Revisions can be set not to be automatically deleted.
IASO Backup  
All versions of files can be kept for different periods of time, starting from 1 month to 1 year or more.
ICFiles  
No files are kept after delete, auto delete clears at every 24 hours.
iDrive  
Up to 30 old versions of files are kept forever (until explicitly removed).
Mozy  
Old version of files are kept for 30 days. Pro 60 days, Enterprise 90 days.[113]
pCloud
Versioning is included for free and paid plans. Deleted files can be restored.
PowerFolder  
Five versions are kept online. In the client it is configurable how many versions to store locally.
SOS Online Backup (Infrascale)
All versions are kept. Only the largest counts towards the storage limit.
SpiderOak
All versions are kept. All files can be undeleted.
SugarSync
Five versions are kept. Only the most recent version of each of existing files as well as deleted files count towards the storage limit.
Syncplicity
Old versions of files, as well as deleted files, are kept for 30 days. Configurable for business or enterprise-class services.
TeamDrive  
All previous versions are kept and can be restored.
Tresorit  
Versioning is included in paid subscription
Zetta Enterprise-grade Online Backup
All versions are kept. All files can be undeleted.

Other Features and Limitations[edit]

Other notable limitations or features.

Box
Performance degrades after 10,000 files in sync folder. Technical limit of 40,000 files in sync folder. Does not sync .tmp files, Outlook PST files, hidden files (hidden folders are synced), or any file or folder with \/*?":<>| in the name.[114]
Dropbox
Performance degrades with more than 300,000 files in sync folder. This is a soft limit.[115]
pCloud
Can exclude certain file types (e.g., .tmp files) with a file type exclusion filter.[116]
Sugarsync
Limited to 80,000 files per top level sync folder. To workaround, you can create multiple syncing folders, but each top level folder is limited to 80k files. Also, Microsoft outlook and Apple iTunes databases are unsupported.[117]

Defunct services[edit]

See also[edit]

Notes[edit]

References[edit]

  1. ^ https://www.grc.com/sn/sn-349.htm
  2. ^ a b How Backblaze uses Encryption to Protect your Data
  3. ^ "Barracuda Backup Service - Integrated Local and Offsite Backup". Barracudanetworks.com. 2009-02-09. Retrieved 2012-10-29. 
  4. ^ Bitcasa
  5. ^ Techcrunch interview with Bitcasa CEO
  6. ^ "Bitcasa CloudFS API". 
  7. ^ Upgradable to 20 GB, with friend referral.
  8. ^ Is there a maximum file size for a single file allowed for being stored in the cloud? "Infinity :)"
  9. ^ http://feedback.bitcasa.com/forums/184524-bitcasa-feature-requests-suggestions/suggestions/3920475-mirroring-an-external-hard-drive- Bitcasa ext HDD support in development
  10. ^ "Bitcasa and Amazon keep redundant backups of all data". 
  11. ^ a b c d e f g h "Clicking Clean: How Companies are Creating the Green Internet" (PDF). Greenpeace. Retrieved 2014-06-15. 
  12. ^ How to mount Box on Linux
  13. ^ How to establish a webdav connection in GNOME3
  14. ^ a b "Box for Enterprise IT: Security Leadership in The Cloud". Box.com. Retrieved 2012-10-29. 
  15. ^ "Box and WebDAV". 
  16. ^ "Box feature comparison". 
  17. ^ "Online Data Backup, Backup Software, Remote Backup – BullGuard". Bullguard.com. 2011-02-15. Retrieved 2012-10-29. 
  18. ^ Managing Your Private Encryption Key
  19. ^ Bandwidth Allocation, retrieved 2012-01-25
  20. ^ [1]
  21. ^ HomePremier and Business plans only: http://www.carbonite.com/en/home/online-backup-pricing
  22. ^ HomePlus, HomePremier and Business plans only: http://www.carbonite.com/en/home/online-backup-pricing
  23. ^ "Network Drive (WebDAV)". 
  24. ^ "Backup Software, Best Windows Backup Software Features - Comodo Backup". Backup.comodo.com. Retrieved 2012-10-29. 
  25. ^ "PRO FAQs". CrashPlan PRO. Codefortytwo Software. Retrieved 2014-05-02. 
  26. ^ "Archive Encryption Key Security". CrashPlan. Codefortytwo Software. October 25, 2013. Retrieved 25 October 2013. 
  27. ^ http://support.crashplan.com/doku.php/faq/mozy#are_crashplan_unlimited_plans_really_unlimited , throttled by setting by default http://support.crashplan.com/doku.php/reference_guide/settings#network
  28. ^ "reference:real_time_backups [CrashPlan Support Site]". Support.crashplan.com. Retrieved 2012-10-29. 
  29. ^ About Us, Code 42 Software 
  30. ^ as a local backup option : http://support.crashplan.com/doku.php/getting_started/attached_drive_shared_folder and to backup : http://support.crashplan.com/doku.php/faq/mozy#can_i_back_up_my_external_hard_drive_thumb_drive
  31. ^ "Cubby and WebDAV". 
  32. ^ "What is Diino?". Diino. Retrieved 2012-10-29. 
  33. ^ Dropbox Lied to Users About Data Security, Complaint to FTC Alleges | Threat Level | Wired.com
  34. ^ Encrypt Files On The Client-Side Before Uploading To Dropbox | DiggFreeware.com
  35. ^ a b c d e Druva Cloud Backup FAQ
  36. ^ a b Security & Privacy - Online Storage Protection and Secure File Sharing for Egnyte Cloud File Server
  37. ^ "Egnyte map drive". 
  38. ^ Linux | ElephantDrive. Home.elephantdrive.com. Retrieved on 2013-08-10.
  39. ^ Download Android App | ElephantDrive. Home.elephantdrive.com (2011-12-09). Retrieved on 2013-08-10.
  40. ^ What is a Personal Key in the encryption settings? : Knowledge Base and Support Center
  41. ^ "ElephantDrive: How do I set up my Trunk (mapped) drive?". 
  42. ^ Everywhere folder : Help Desk. Support.elephantdrive.com (2012-07-05). Retrieved on 2013-08-10.
  43. ^ Tutorials. Vault.elephantdrive.com. Retrieved on 2013-08-10.
  44. ^ "Where is my ElephantDrive data physically stored?". 2009-09-04. Retrieved 2014-06-15. 
  45. ^ "Security : Support Center". Support.filesanywhere.com. 2011-05-20. Retrieved 2012-10-29. 
  46. ^ Privacy Policy : Support Center
  47. ^ "FilesAnywhere WebDAV Drive Mapping". 
  48. ^ Google Drive Is Coming to Linux
  49. ^ Teresa Wu, community manager for Google drive apps promised linux client in Apr 2012
  50. ^ Google Drive for Linux Screenshots leak after years of promises
  51. ^ [2]
  52. ^ Google Docs, Sheets, and Slides size limits "Files that you upload but don’t convert to a Google Docs, Sheets, or Slides format can be up to 5TB each."
  53. ^ Google Green - Renewable energy
  54. ^ http://www.handybackup.net/online-backup.shtml
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