Can I rename a backup?

So, I derped, and I now have two 2tb volumes which are named wrong in my backup scheme. Is it possible for me to rename the existing backups, or will I have to start over from scratch and wait for them to copy all over again?

Unfortunately, you can’t rename a backup but if you re-add the repository with a new name and do your initial backup to the same storage, most of the chunks will merely be skipped. It’ll just take a bit longer (similar to if you ran another backup with -hash).

Once you’ve complete the first backup, it’s then safe to prune the old one.