Clean_up_snapshots_service.clean_up dont work

Hello,
I have installed the Hacs integration “Clean up snapshots”.

I have set in the configuration the needed parameter.

Then I have make an automation:

alias: Automatisches Backup aufräumen
description: ''
trigger:
  - platform: time
    at: '03:00'
condition: null
action:
  - service: clean_up_snapshots_service.clean_up
    data:
      number_of_backups_to_keep: 2
mode: single
initial_state: 'on'

But if I start the automation manuelle they dont delete the “old” Backups.

Do this integration dont work with the actually Home Assistant version or make I something wrong?