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Filesystem mirroring: best backup tool?
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The question is not which tool should I use?
The question is what is it that you want to achieve? That will drive your choice of tools.
I want to mirror my drive can be achieved by a lot of tools. But I want to be able to restore a file I accidentally deleted up to 24 hours with a 1 hour interval is a totally different game.
For backups I am very fond of restic as it does a lot of things in a simple way: encryption, (incremental) snapshots, mounting of said snapshots, support various storage backends, policy based purging, tagging, …
Your tool may not be able to do all you need, like automated scheduled backups, so you will need to also learn cron (or whatever scheduler you may have)
And finally, what about maintenance? What should happen to all those files you’ve synced? How long do you want to keep them?