Backup issue - log is OK but not found in /mnt

Hi, we noticed something in Virtualmin. Our backup log is telling a back-up is done only by opening path from alphabet V all sites are missing in /mnt/backups. There is also no page 2 or 3. So, it is a strange thing.

So, log is telling backup is done well only backup we cannot find from last alphabet V. Is this an known issue? and where to find or does someone knows a solution?

We use Virtualmin GPL.