After years of looking at it, I've been using borg for almost a year now, and I've already replaced rsnapshot with it pretty much everywhere. I'm very happy with the deduplication feature (that's my main motivation for switching), but the performance and ease of use are very appreciable too. Actually, performance might be as much as a game changer for me as deduplication (though a less expected one), as I find myself doing and automating backups way more often than before. I also enjoy the ability to do append-only backups which mitigate the risks of losing already save data because of bug / malware.

I've been expecting more and more from it, and at this point, there are only two things I wish would be better supported: - deduplication across several machines (you can already backup several machines to the same repository, but it's not efficient); - builtin redundancy to deal with bitrot.

I'm still using rsnapshot for secondary backups, as I can't afford a bug in backup software, but I'm considering switching to restic for that, as it provides deduplication as well and doesn't share code with borg.