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 six alternatives to ZBackup for a variety of platforms, including Linux, Mac, Windows, Arch Linux and Fedora. The best alternative is Duplicati, which is both free and Open Source. Other great apps like ZBackup are Restic (Free, Open Source), Borg Backup (Free, Open Source), Duplicity (Free, Open Source) and rdiff-backup (Free, Open Source).
Duplicati is a backup client that securely stores encrypted, incremental, compressed backups on local storage, cloud storage services and remote file servers. The Duplicati project was inspired by Duplicity and had similar functionality until 2008.
Easy: Doing backups should be a frictionless process, otherwise you are tempted to skip it. Restic should be easy to configure and use, so that in the unlikely event of a data loss you can just restore it. Likewise, restoring data should not be complicated.
rdiff-backup backs up one directory to another, possibly over a network. The target directory ends up a copy of the source directory, but extra reverse diffs are stored in a special subdirectory of that target directory, so you can still recover files lost some time ago.