During a backup job Veeam Endpoint Backup returns the following warning:
Unable to exclude files from snapshot: Shadow Copy Optimization Writer timed out
The warning occurs in the following scenario: file-level backup is selected as backup mode, then a whole volume is selected, and a number of folders is explicitly excluded from backup.
The issue is caused by MS Copy Optimization Writer timeout due to a large number of excluded files. In such cases the Application Event Log on the affected workstation may contain entries similar to the one below:
Event ID: 8220
Execution Context: Shadow Copy Optimization Writer
Writer Name: Shadow Copy Optimization Writer
Two possible approaches are suggested.
If you have further questions, open a support case as follows:
- Right-click the Veeam Endpoint Backup / Veeam Agent for Windows icon in the system tray and select Control Panel.
- Click the Support link at the top of the window.
- Click Technical Support to submit a support case to the Veeam Support Team directly from the product.