Bulk Restore

you can bulk restore by calling 'pct restore' / 'qmrestore' (or the corresponding API endpoints, or if you do it manually, also the restore feature in the GUI). there is nothing that forces you to only restore backups one at a time, other than possible contention on some locks (e.g., allocating a new disk may require obtaining a storage-wide lock for a short amount of time to prevent naming conflicts). I recommend staggering and batching the restores, you likely won't benefit from having more than a few restores running in parallel if the backup source and the storage target are identical across the jobs.
 
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I usually wipe the server and restore the VM's from backup when I run into an serious issue. I usually try to make a working backup of all my vm's before I wipe my vm server.
 

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