Data Backup Software and Service

The hard disk and partition imaging software take a snapshot of your hard disk so that you can restore your system at a later time to the exact same state the system was when you imaged the disk or partition. This is useful for system recovery in case of a hard disk disaster. The term "image" is used because such software often copy the state of the hard disk sector by sector to your image. Hence if your hard disk was (say) defragmented with certain software occupying certain sectors when you backed up, it will be returned to that same state when you restore your backup. The image utilities often do not allow fine control what you backup - you can specify the partitions or hard disks to back up, but you usually will not be able to specify which folders to exclude or include. They are useful for backing up your system drive or partition, that is, the drive that you placed your operating system on. Hard disk imaging software are sometimes also used to clone a hard disk to another (useful for the times you change or upgrade your hard disk).

On the other hand, the hard disk, folder and files backup software listed here allow a finer control over what you back up. You can selectively backup and restore (say) your documents and email while omitting other files and directories. Some of the utilities allow you to schedule your backups, so that you can be sure that your important data are backed up periodically (for example, daily, weekly, monthly, etc). Depending on the utility, it may or may not support the backup of your system drive (the drive you booted from).

Free Hard Disk Backup and Restore Utilities

BackupPC Open Source Backup

BackupPC allows you to back up your Windows, Linux and Mac OS X PCs, desktops and laptops to a server's disk. It either uses SMB, tar over SSH/RSH/NFS or rsync. The program is written in Perl and is open source.
Amanda Backup and Recovery Software Community Edition

The Amanda Community Edition is an open source backup and recovery software for Linux. Administrators can set up a backup server to back up mulitiple host computers to a single tape drive, tape changer or hard disk via the network.

Microsoft SyncToy

Microsoft SyncToy allows you to synchronize your data between two storage locations, so that you can keep the latest version of your files in both locations. The tool is also able to track situations when you rename a file, and it makes sure that the file in the other storage area is also renamed. The tool only works under Windows XP SP 2 and requires the .NET framework.

Back4Win

Back4Win allows home users the ability to backup and restore your data to ZIP and self-extracting EXE files. You can control the level of compression of your data files, span disks, predefine the disk size (to suit CD-Rs and CD-RWs), password-lock your backups, burn to CD-R/W, restore from damaged backups, etc.

Cobian Backup

Cobian Backup is a backup and restore utility that can backup your files and directories to another directory or drive on the same computer or to another computer on your network. It also supports FTP backup. You can compress and encrypt your backups. Standalone decompression and decryption utilities are also available so that if you wish, you can recover your files without having to use the backup program. Included with the backup program is a scheduler, so that you can schedule your backups to occur, say, every night when you are not using the computer. The program also supports remote backups. This is a Windows program.

FreeByte Backup

Freebyte Backup is a Windows program that supports the backing up files and directories to a backup directory. It also handles incremental backups, where only files not already in the backup set is saved, scheduled backups and profiles.
Unison File Synchronizer