The Windows File System plug-in uses Microsoft Volume Shadow Copy Service to perform backups. The backups include open files because Avamar backs up the data from the Shadow Copy volume instead of the original volume. However, according to Microsoft best practices, Avamar skips the files in the following table by default.
Table 1. Files skipped in Windows file system backups
Operating system
Files skipped by default
Comments
All Windows
Files listed in the
FilesNotToBackup registry for the system and current user
The skipped files include operating system files that are necessary to restore the system.
All Windows
Temporary Internet Files
You can enable backup of these files through special flags.
All Windows
Outlook 2003 temporary cache files
You can enable backup of these files through special flags.
Windows 7 or later
All
Syscache.hve* files under System Volume information
These additional files do not appear in the
FilesNotToBackup registry, but Microsoft indicates that backups should skip them.
Windows 7 or later
All
.vhd and
.vhdx files for a mounted Virtual Hard Disk (VHD)
Back up the VHD file system, not the
.vhd file.
Windows Server 2019, 2016, or 2012
All
.vhd and
.vhdx files on file shares on clustered file servers
Explicitly select the VHD file for backup, and use the Windows Cluster File Server plug-in. If you select only the parent folder or the file server for the VHD file, then the backup skips the VHD file.
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