Think about using rsync for back up copies
Created by: foobacca
rather than making a recent copy and then deleting an old copy, we could:
- check there are enough old versions, if not just do a copy as usual, but if there are:
- rename the old copy to
rsync_target
- rsync the current version to
rsync_target
- rename
rsync_target
to the current date/time and then use that as the new copy
The rsync should be a lot faster than the copy.