Versioning is a recommended approach to back up files as protection against hardware failures and user errors. To create versioned backups, you can use established backup programs or an open source tool that originates from the developer world: Git.

Not every backup tool is useful for backing up entire data media. Rescuezilla makes perfect bit-level copies of mass media in a matter of minutes, so you can completely reconstruct the system if disaster strikes.

Let users recover a deleted file without admin intervention by aliasing the rm command with mv or by writing your own script that moves the data to another location.