Backups are not rotated according to the value of Maximum number of full backup files to store and Keep backup files for settings in Tools & Settings > Backup Manager > Schedule or Domains > example.com > Backup Manager > Schedule
Backup rotation fails with the following error in
ValueError: time data '1' does not match format '%Y-%m-%d-%H%M%S'
This is a Plesk bug with ID #PPPM-10423 which will be fixed in future updates.
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As a workaround:
Connect to the server via SSH
Create folder to back up the log files:
# mkdir /root/backup-PPPM-10423
Back up the log files:
# cp -a /var/log/plesk/PMM/*.log* /root/backup-PPPM-10423
Delete the logs from the original location:
# rm -rf /var/log/plesk/PMM/*.log*
Restart the server to make sure there aren't stuck or zombie processes running