@Eric_Ramsey am I right thinking that you simply missed 22.04 repository in OBS?
Your problem with PPA has nothing to do with UrBackup, it’s just the way PPA works for all packages. I believe it’s explained in UrBackup’s documentation too.
Here is the official repository for 22.04:
https://software.opensuse.org/download.html?project=home%3Auroni&package=urbackup-server