16 Jun Started getting VSS errors during Backups? A June Windows Server update may cause backup issues!
Microsoft has recently added a new security patch (CVE-2022-30154) in the Microsoft File Server Shadow Copy Agent Service (RVSS) to address an elevation of privilege vulnerability. However, this has affected some VSS operations for backups where data exists on remote SMB V3.0 above shares.
Windows backup applications may receive E_ACCESSDENIED errors during shadow copy creation operations and a “FileShareShadowCopyAgent Event 1013” will be logged on the File Server.
Bleeping Computer has more detail on this issue at https://www.bleepingcomputer.com/news/microsoft/microsoft-june-windows-server-updates-may-cause-backup-issues/amp/ and advises any users affected to update to the latest June Microsoft Security Patches that should address this issue.