Because we do want to have verified backups, we tried out scheduled verification tasks. Then we have the problem, that it takes to long (>1d) to verify all ~250 new snapshots sequentially. 50 parallel verify jobs works well.
AFAIK, a verification job will not re-verify a chunk that has been verified already by that same job, meaning that a verify job for 2+ snapshots should be more efficient that a verify job for each snapshot or doing an inmediate verify after each backup.
On the other hand, verifies are processed sequentially, so even if your host has enough resources the job will take some time to finish. The approach I currently use is to get a few verify jobs for each namespace and start them at the same time if possible.
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