t try alot of time to Backup my Virtual Servers and i get same thing
Testing backup destination local file /tmp/.webmin/root:virtualmin-backup.tar.gz …
… done
Creating backup for virtual server my site
Copying virtual server configuration …
… done
Backing up Cron jobs …
… none defined.
Creating TAR file of home directory …
… done
Copying records in DNS domain …
… zone file not found!
Further to what Stefan said if it’s just the standard DNS records you use for each site then you could switch off/on DNS site enabled in virtualmin > site.tld > edit virtual server on the old server which may regenerate those files. However I would let someone from the virtualmin team confirm this first!