Time Vault 0.73
Time Vault is a GNOME-based Linux-equivalent to Time Machine from Apple.
Like many backup utilities, it creates incremental backups of files that can be restored at a later date. Its snapshots are copies of a directory at a certain point in time. Snapshots use very little space for the files that haven't changed since the last snapshot was made. This is because instead of backing up the entire unchanged file, snapshots use hard links that point to the existing backup of the unchanged file.
Ubuntu 9.04 or higher.