When it comes to syncing files across directories or devices, most developers and power users turn to time tested tool like rsync. It’s fast, efficient, and ideal for one way synchronization. But what if you need true bidirectional sync, where changes in either directory are reflected in the other, automatically resolving conflicts and preserving the most recent updates?

That’s where Unison comes in.

Why Not Just Use rsync?

rsync excels at unidirectional sync, usually from a source to a target. However, It does not fit for use-case of trying to have a mirrored locally mounted directories of two cloud providers: