Get a Quote     (408) 943-4100   TrueNAS Discord VendOp_Icon_15x15px Commercial Support
TrueNAS.com Software Systems Company Community Security iX Portal Download
TrueNAS CORE TrueNAS Enterprise TrueNAS SCALE Compare Editions TrueCommand Software Status FreeNAS
Compare Systems F-Series M-Series X-Series R-Series Mini Series
About iXsystems Our Clients Reviews Careers Awards iX Blog & News iX Website Contact Us
Community Forum Discord TrueNAS GitHub TrueNAS Merch Store
Application Analytics Backup and Archival Cloud Data Mobility File Sharing iX Storj Media Creation Video Surveillance Virtualization
Industry Automotive Education Gaming Government Healthcare MSP Manufacturing Research & AI Media & Entertainment
Download TrueNAS CORE Download TrueNAS SCALE Get TrueNAS Enterprise Compare TrueNAS Editions Where to Buy
  1. Documentation Hub
  2. /
  3. TrueNAS CORE
  4. /
  5. CORE Tutorials
  6. /
  7. Sharing
  8. /
  9. Windows Shares (SMB)
  10. /
  11. Shadow Copies
Edit page
TrueNAS CORETrueNAS CORE Nightly Development Documentation
This content follows experimental early release software. Use the Product and Version selectors above to view content specific to a stable software release.

Shadow Copies

  2 minute read.

Last Modified 2023-11-17 11:50 EST

Shadow Copies, also known as the Volume Shadow Copy Service (VSS) or Previous Versions, is a Microsoft service for creating volume snapshots. Shadow copies can be used 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 located within the path of the SMB share.

There are a few caveats about shadow copies to be aware of before activating the feature in TrueNAS:

  • When the Windows system is not fully patched to the latest service pack, Shadow Copies might not work. If no previous versions of files to restore are visible, use Windows Update to ensure the system is fully up-to-date.

  • Shadow copy support only works for ZFS pools or datasets.

  • Appropriate permissions must be configured on the pool or dataset shared by SMB.

  • Users cannot use an SMB client to delete shadow copies. Instead, the administrator uses the TrueNAS web interface to remove snapshots. Shadow copies can be disabled for an SMB share by clearing the checkmark from Enable shadow copies for the SMB share. This does not prevent access to the hidden .zfs/snapshot directory for a ZFS dataset when the directory is located within the path for an SMB share.

To enable Shadow Copies, go to Sharing > Windows Shares (SMB) and Edit an existing share. Open the Advanced Options, find the Other Options and select Enable Shadow Copies.

SMBShadowCopy

Windows 10 v2004 Issue

Some users have experienced issues in the Windows 10 v2004 release where network shares can’t be accessed. The problem appears to come from a bug in gpedit.msc, the Local Group Policy Editor. Unfortunately, setting the Allow insecure guest logon flag value to Enabled in Computer Configuration > Administrative Templates > Network > Lanman Workstation appears to have no effect on the configuration.

To work around this issue, edit the Windows registry. Use Regedit and go to HKLM\SYSTEM\CurrentControlSet\Services\LanmanWorkstation\Parameters. The DWORD AllowInsecureGuestAuth is an incorrect value: 0x00000000. Change this value to 0x00000001 (Hexadecimal 1) to allow adjusting the settings in gpedit.msc. You can apply this to a fleet of Windows machines with a Group Policy Update.

Related Content

CORE Tutorials
CORE UI Reference
General Reference

Have more questions?

For further discussion or assistance, see these resources:

Found content that needs an update?  You can suggest content changes directly! To request changes to this content, click the Feedback button located on the middle-right side of the page (might require disabling ad blocking plugins).