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VSS_E_HOLD_WRITES_TIMEOUT
VSS_E_HOLD_WRITES_TIMEOUT means that the provider could not complete the shadow copy while file-system writes were frozen. VSS keeps the freeze interval short to preserve application availability, so long-running provider work or excessive I/O can abort the operation.
How to investigate
- Check storage and application activity during the snapshot window.
- Review VSS writer and provider events to identify which phase did not complete.
- Retry when the volume is less busy and resolve storage performance or provider issues before increasing backup concurrency.
Microsoft: VSS freeze and provider timing
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