For backup, Apple people think of the app 'Time Machine' and Windows people use all sorts of different apps.
Rsync is an old yet reliable standards-based backup method that works across many platforms. It's one of those stable and reliable solutions like VNC.
Personally I use rsync to mirror my OpenFiler NAS servers. It does the job well.
Grsync is a great backup solution for Mac users working on a Windows-based network or Unix environment.
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