Validator "backup" Returned Fail Status

when i try tp update ver. 4.8.1 sp1 i get the above error. increased space 2X and still does not work. Changed max exc. time to 90. any ideas.

https://docs.cs-cart.com/4.4.x/upgrade/possible_upgrade_issues.html#validator-backup-returned-fail-status

From docs

The error means that the backup wasn’t created. The problem could be caused by the lack of hard drive space.

Please check