Absolutely, if you can't use a filesystem with checksums (zfs, btrfs, bcachefs) then rsync is a great idea. I think filesystem checksums have one big advantage

Absolutely, if you can't use a filesystem with checksums (zfs, btrfs, bcachefs) then rsync is a great idea. I think filesystem checksums have one big advantage vs rsync. With rsync if there's a difference it isn't clear which one is wrong.