Methods for Verifying backups?

One certain method for verifying the completeness & integrity of a ZeXtras Backup is to export the backup, and restore it to a clean/new Zimbra instance, e.g. launched in a VM.

That's certainly doable, but a fair amount of work. And hardly automated.

Previously, with my own backup scripts, I'd calculate full-backup per-file and complete-store hashes of the source & destination. If the hashes matched, the backup was known to be good. That assumed, of course, identical source & destination file names/formats/etc.

As Zextras functions differently, afaict, that's not doable.

What more-efficient methods for verifying completeness/integrity a ZeXtras backup -- all data & content -- exist?