This article provides information about VSS settings.
Xopero ONE uses Shadow Copy (aka Volume Snapshot Service, Volume Shadow Copy Service, or VSS) for its backup operations. VSS is a technology included in Microsoft Windows that can create backup copies or snapshots of computer files or volumes, even when they are in use.
When creating a backup plan, you can enable the use of VSS in the Advanced settings—simply toggle the switch. You can also allow the backup to continue even if VSS errors occur.