1. Snapshot creation failed due to Windows VSS failure 
2. There is not enough Shadow Copy storage space to create a backup
3. A VSS writer is in a failed state
4. A volume does not pass a CheckDisk (chkdsk)
5. The Master File Table is highly fragmented
6. A volume is extremely fragmented
7. Another application interrupted the snapshot creation
8. An uninstalled backup application left behind its VSS provider
9. The OS does not pass a System File Checker (SFC) scan
10. A Windows Server Backup disk is online 

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