Backing Up Microsoft Outlook Offline Folder Files (.ost) Estimated reading: 0 minutes 239 views Contributors Summary: This guide helps fix an issue where Microsoft Outlook .ost files are not backed up because they are excluded from the VSS snapshot by default. Tagged:MicrosoftOutlook Backing Up Microsoft Outlook Offline Folder Files (.ost) - PreviousDisable Cloud Storage Options in Microsoft OutlookNext - Backing Up Microsoft Outlook Offline Folder Files (.ost)Remove Sync Conflicts with Outlook (Classic)