When enabling the checkbox "
Do not compress backup files" at Home > Settings > Backup Settings and running backup of a domain from
Backup Manager in Plesk GUI, backup is being compressed regardless the compression settings. Scheduled Backup also ignores these settings.
This issue has been completely fixed in Plesk since version 11.5. Upgrade Plesk to version 11.5 or higher.
Hotfix for Plesk 9.3 and 11.0.9
For Plesk 9.3
For Plesk 11.0.9
Replace backup.create.php in