Delete a Hyper-V VM's backups from vaults and Portal
You can delete backups for one VM in a Hyper-V backup job from vaults and Portal, without deleting the entire backup job.
WARNING: Data deletion is permanent. After the data is deleted from vaults, it cannot be recovered or restored.
To delete a Hyper-V VM's backups from vaults and Portal:
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On the navigation bar, click Computers.
The Computers page shows registered computers and environments.
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Click the Hyper-V environment row with the VM for which you want to delete backups.

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Click the Jobs tab.
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Find the backup job with the VM for which you want to delete backups, and expand its view by clicking its row.
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Remove the VM from the backup job by selecting the VM in the Protected by this job box, and then clicking Unprotect selected.

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Create a new Hyper-V backup job. Add the VM for which you want to delete backups. For more information, see Add a Hyper-V backup job.
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Delete the backup job that you created in Step 6. For more information, see Delete a backup job and delete job data from vaults.