Update Windows/BackupGPO.md

Windows/BackupGPO.md

@@ -81,4 +81,12 @@ Get-ChildItem -Path $path -Recurse -Force | Where-Object { !$_.PSIsContainer } |
 Get-ChildItem -Path $path -Recurse -Force | Where-Object { $_.PSIsContainer -and (Get-ChildItem -Path $_.FullName -Recurse -Force | Where-Object { !$_.PSIsContainer }) -eq $null } | Remove-Item -Force -Recurse
 
 Remove-Item -Path $temp -Force
+```
+
+## possible command for the cronjob on the linux system
+
+You can run this without the `-delete` and you will see affected files by the filter.
+```bash
+# -mtime +10 => older than 10 days
+find /backup/gpos -mtime +10 -type f -delete
 ```