script delete old backups dont work

[esyx-xyse]

The script works for me without problems with rclone to gdrive only the delete old backups feature does not work.

`[2021-10-16 18:30:26.868442] INFO: Cleaning backup dir...

[2021-10-16 18:30:27.068091] ERROR: backup_1-16-10-2021_04-00.tar.gz can't be deleted!

[2021-10-16 18:30:27.068156] ERROR: backup_2-16-10-2021_04-00.tar.gz can't be deleted!

[2021-10-16 18:30:27.068175] ERROR: backup_3-09-08-2021_04-00.tar.gz can't be deleted!

[2021-10-16 18:30:27.068188] ERROR: backup_3-16-10-2021_04-00.tar.gz can't be deleted!

[2021-10-16 18:30:27.068199] ERROR: mysqlbackup-16-10-2021_04-00.sql can't be deleted!
`