This is a wish for one additional feature: I'd like a flag to determine a maximum age x. If the last backup file is older than x, then copy instead of hardlink.

The reason: I feel unsafe if an important file was written to memory only once years ago and is only hardlinked since then. I'd feel better if it's written anew once in a while. Of course this relies on the original file aging better than the old Backup copy. So addtionally it would make sense to verify the versions against each other, but I guess that is a lot more work than my proposal above.