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Using SMB Shadow Copy
3 minute read.
Last Modified 2024-01-26 15:06 ESTEnable Shadow Copies exports ZFS snapshots as Shadow Copies for Microsoft Volume Shadow Copy Service (VSS) clients.
Shadow Copies, also known as the Volume Shadow Copy Service (VSS) or Previous Versions, is a Microsoft service for creating volume snapshots. You can use shadow copies to restore previous versions of files from within Windows Explorer.
By default, all ZFS snapshots for a dataset underlying an SMB share path are presented to SMB clients through the volume shadow copy service or are accessible directly with SMB when the hidden ZFS snapshot directory is within the SMB share path.
Before you activate Shadow Copies in TrueNAS, there are a few caveats:
Shadow Copies might not work if you have not updated the Windows system to the latest service pack. If previous versions of files to restore are not visible, use Windows Update to ensure the system is fully up-to-date.
Shadow Copies support only works for ZFS pools or datasets.
You must configure SMB share dataset or pool permissions appropriately.
To enable shadow copies, go to Shares > Windows (SMB) Shares and locate the share.
If listed on the widget, select the Edit option for the share.
If not listed, click Windows (SMB) Shares
to open the Sharing > SMB list-view screen. Select the share, then click the for the share, then click Edit to open the Edit SMB screen.Click Advanced Options, scroll down to Other Options, and then select Enable Shadow Copies.
Click Save.
Users with an SMB client cannot delete Shadow copies. Instead, the administrator uses the TrueNAS web interface to remove snapshots.
Disable shadow copies for an SMB share by clearing the Enable shadow copies checkbox on the Edit SMB screen in the Other Options on the Advanced Options screen for the SMB share.
Disabling does not prevent access to the hidden