If you want to free space on Backups you can use find to select a special month:
find -newerct "1 Sep 2023" ! -newerct "1 DEC 2023" -delete
This command removes files created from 01.Sep.2023 to 01.Dec.2023.
..very useful..
Linux: find files modified in special Month
This command removes files created from 01.Sep.2023 to 01.Dec.2023.