I noticed this last night and was going to report it, but no need to do so now.
Be aware, however, that the default setting for scheduled backups is to stop the backup if it fails at any point. For the time being at least, it would be a good idea to change that so the rest of the servers and features will be backed up. Otherwise if the failed backup occurs early in the list of virtual servers, the rest will not be backed up at all.
Also, just FYI, I’ve only noticed this on sub-servers, not parent servers.
I came to report the same problem, for information, it appeared with the update of Virtualmin version 7.7. Everything is handled internally without errors (and Scheduled Backups were working before the update).
Copying virtual server configuration …
… done
Backing up Cron jobs …
… none defined.
Creating TAR file of home directory …
… done
Copying records in DNS domain …
… domain not found!
It’s only happening on domains that I have the Hosting for DNS records as Cloudflare DNS