snapper-io is described as 'Snapper is a tool for Linux filesystem snapshot management. Apart from the obvious creation and deletion of snapshots, it can compare snapshots and revert differences between snapshots'. There are eight alternatives to snapper-io for a variety of platforms, including Mac, Linux, Windows, Android and BSD. The best alternative is rsync, which is both free and Open Source. Other great apps like snapper-io are Time Machine (Free), Duplicacy (Freemium, Open Source), Rsnapshot (Free, Open Source) and Nero BackItUp (Freemium).
Time Machine is the breakthrough automatic backup that’s built right into Mac OS X. It keeps an up-to-date copy of everything on your Mac — digital photos, music, movies, TV shows, and documents. Now, if you ever have the need, you can easily go back in time to recover anything.
Nero BackItUp protects your files and memories on your PC or laptop. Have your filed automatically backed up on up to 3 locations, such as USB hard disks. All you need to do is click one button to set up your backup.
A graphical user interface for rsync, which looks-and-feels like a standard FTP client, but uses the rsync protocol ‘under the hood’ to boost transfer speeds. In technical terms, it’s an SSH browser with an rsync transfer engine.
Lsyncd watches a local directory trees event monitor interface (inotify or fsevents). It aggregates and combines events for a few seconds and then spawns one (or more) process(es) to synchronize the changes. By default this is rsync.