ZBackup is described as 'Globally-deduplicating backup tool, based on the ideas found in rsync. Feed a large .tar into it, and it will store duplicate regions of it only once, then compress and optionally encrypt the result' and is an app in the backup & sync category. There are more than 10 alternatives to ZBackup for a variety of platforms, including Linux, Mac, Windows, BSD and FreeBSD apps. The best ZBackup alternative is Duplicati, which is both free and Open Source. Other great apps like ZBackup are Restic, BorgBackup, ByteSync and Plakar.