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Better than rsync is using support for snapshots and replication in the filesystem, such as described for ZFS in

https://serverfault.com/questions/842531/how-to-perform-incr...

Btrfs and apfs also support auto-snapshotting and replication, but I don't have experience with them.

ZFS snapshots also have the added benefit of not taking up duplicate space. And, should a Linux ransomware ever come into existence, snapshots help against them.

Btrfs and apfs also support copy-on-write snapshots.

Also, snapshots are NOT backups. And one definitely should not rely on snapshots along to keep their files safe.

They aren’t; a backup should preferably be offsite, but nothing is perfect

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