2020-04-26 06:18:55 -04:00
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---
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layout: doc
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title: Volume Backup and Revert
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2020-04-26 06:28:41 -04:00
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permalink: /doc/volume-backup-revert/
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2020-04-26 06:18:55 -04:00
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redirect_from:
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2020-04-26 06:28:41 -04:00
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- /en/doc/volume-backup-revert/
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- /doc/VolumeBackupRevert/
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- /wiki/VolumeBackupRevert/
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2020-04-26 06:18:55 -04:00
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---
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Qubes Volume Backup and Revert
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==============================
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With Qubes, it is possible to revert one of a VM's storage volumes to a previous
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state using the automatic snapshot that is normally saved every time a VM is
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shutdown. (Note that this is a different, lower level activity than the
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[Backup, Restoration, and Migration](/doc/backup-restore/) process.)
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In Qubes, when you create a new VM, it's volumes are stored in one of the
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system's [Storage Pools](/doc/storage-pools/). On pool creation, a
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revisions_to_keep default value is set for the entire pool. (For a pool creation
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example, see [Storing AppVMs on Secondary Drives](/doc/secondary-storage/).)
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Thereafter, each volume associated with a VM that is stored in this pool
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inherits the pool default revisions_to_keep.
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For the private volume associated with a VM named vmname, you may inspect the
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value of revisions_to_keep from the dom0 CLI as follows:
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qvm-volume info vmname:private
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The output of the above command will also display the "Available revisions
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(for revert)" at the bottom. For a very large volume in a small pool,
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revisions_to_keep should probably be set to the minimum value of 1 to minimize
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the possibility of the pool being accidentally filled up by snapshots. For a
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smaller volume for which you would like to have the future option of reverting,
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revisions_to_keep should probably be set to at least 2. To set
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revisions_to_keep for this same VM / volume example:
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qvm-volume config vmname:private revisions_to_keep 2
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With the VM stopped, you may revert to an older snapshot of the private volume
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from the the above list of "Available revisions (for revert)", where the last
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item on the list with the largest integer is the most recent snapshot:
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qvm-volume revert vmname:private <revision>
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