Comparison of online backup services

This is a comparison of online backup services.

Legend

 * Windows/Linux/Mac - Supported operating systems for thick client (native binary application), which provide background data transmission and setting services.
 * Encryption - Data stored by the service is encrypted. (Transport security is also assumed)
 * Payment method
 * L - Pay per computer. Additional fee for storage over a threshold.
 * U - Pay per computer. Storage per computer is unlimited.
 * M - Pay per unit of storage, but unlimited computers may share that storage.
 * B - Bandwidth capping or limits are used on accounts.
 * Net drive - Network drive on file server supports some protocols (FTP, SMB, NAS,...)
 * P2P storage - data spread over many computers based on Peer-to-peer net advantages
 * Sync - Synchronization between computers, and/or mobile devices (PDA, MDA,...)
 * Public Internet file hosting -
 * Restore via physical media -
 * Server location - country where physical servers are located
 * Still in Beta version
 * Whether the desktop client (if available) can detect and upload changes without scanning all files
 * 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.
 * External hard drive support - Can refer to an alternate backup destination or whether the service can back up external drives.
 * 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.

Comments

 * Acronis 	: up to 5PCs, always incremental backups, remote access from the web
 * Backblaze 	: Data de-duplication; block-level incremental
 * Barracuda Backup Service 	: Data de-duplication; real-time hybrid onsite/offsite data back-up
 * BullGuard Backup 	: 5PC/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/ Black berry/ 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.
 * Dolly Drive 	: Only Cloud Storage that integrates Apple's Time Machine
 * Diino 	: iPhone/Android app available.
 * Dropbox 	: Data de-duplication, delta sync, iPhone/Android/Blackberry app available.
 * Egnyte 	: Delta sync, Google Docs sync, user and group management
 * ElephantDrive 	: Auto-transfer from defunct Xdrive.
 * Fabrik Ultimate : Backup 	Block-level incremental backups, Encryption: 128 bits standard, 448 bits optional, limited account of up to 3 GB is free. Acquired by Hitachi.  According to their tech support, their offering is a branded version of Memopal.
 * FilesAnywhere 	: Mark Cuban acquired minority interest in 2006. Android, iOS, BlackBerry Apps available. Dedicated server options available. CoolBackup software used for Backup/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.
 * 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 onsite / 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).
 * Mosaic : For photographers, integrated with Lightroom and Aperture.
 * Mozy 	: Data de-duplication; block-level incremental
 * Sky Backups     : Encrypted, Compressed incremental
 * Skyfile 	: Data de-duplication."Zero Knowledge" encryption.
 * SpiderOak 	: Data de-duplication."Zero Knowledge" encryption.
 * Syncplicity 	: Google Docs sync, Central Management with Business Console
 * Ubuntu One 	: GPL client
 * Unitrends Vault2Cloud 	: Data de-duplication; hybrid on- & off-premise 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.
 * Windows Live Mesh 	: replaces windows live sync and windows live folder
 * Wuala 	: Client-side encryption
 * Zmanda Cloud Backup 	: Available in German and Japanese languages, supports MS SQL Server, MS Exchange, SharePoint, MySQL Database, System State, Oracle
 * ZumoDrive 	: Cloud appears local to filesystem, content streaming, predictive caching, delta sync

Versioning
Any changes can be undone, and files can be undeleted.
 * 9GBackup 	: Versions are set by the user when choosing the file/folder to backup. Versions can be set to unlimited but they do use the storage that you have purchased.
 * Acronis 	: supports detailed history of changes to files with browsing by date or version number
 * Backblaze 	: Old versions of files are kept for 30 days.
 * Crashplan 	: Options: All, or staged (daily, then weekly, etc.)
 * Dolly Drive 	: Yes
 * Dropbox 	: Yes
 * Skyfile 	: All versions are kept. All files can be undeleted.
 * SOS Online Backup 	: All versions are kept. 0nly 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 counts towards the storage limit.
 * Wuala 	: Ten versions are kept. Only the most recent counts towards the storage limit.

Defunct services

 * Xdrive
 * drop.io
 * Zumo Drive