retention

At what relative time in the future, compared to its creation time, the backup should be deleted, e.g. keep backups for 7 days. A duration in seconds with up to nine fractional digits, ending with 's'. Example: "3.5s". For a daily backup recurrence, set this to a value up to 7 days. If you set a weekly backup recurrence, set this to a value up to 14 weeks.