Windows　Server　error

Question

KENJI IWAGUCHI 40

毎日サーバーをバックアップしておりますが、週１回ほどバックアップが失敗します。

バックアップの失敗頻度が高くなり、サーバーの再起動を実施（2025/12/4　17:30頃）。その後バックアップの失敗もなく不要なバックアップ容量を使用することもありませんでしたが、本日（2025/12/11）バックアップエラーがあり、容量が７ＧＢ使用され解放されません。

不要バックアップ失敗データを削除し、空き容量を開放する方法をお教えください。

よろしくお願いいたします。

Answer accepted by question author

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Answer 1

To free up space from failed backup data on Windows Server, you can follow these steps:

Identify and Delete Orphaned Shadow Copies:
- Use the command vssadmin list shadows to list all shadow copies. If you find any that are no longer needed, you can delete them using vssadmin delete shadows /all or specify particular shadow copies to delete.
Run Maintenance Jobs:
- If you are using data deduplication, manually run maintenance jobs to clean up unnecessary data. You can do this with the following PowerShell commands:
```
     Start-DedupJob -Volume <DriveLetter> -Type GarbageCollection -Full
     Start-DedupJob -Volume <DriveLetter> -Type Scrubbing -Full
```
Check for Disk Space Issues:
- Ensure that the disk where backups are stored has sufficient space. If the deduplicated volume is critically low on free space, consider expanding the volume or investigating file patterns to find large files that may not be visible in user data.
Clear Backup Logs:
- If your backup solution generates logs, check if you can clear old logs that are no longer needed to free up space.
Review Backup Configuration:
- Ensure that your backup configuration is optimized to avoid unnecessary backups, which can consume space. Adjust the schedule or retention policies as needed.

Following these steps should help you manage and free up space from failed backups on your Windows Server.