delete before-date / delete older-than

[epipho]

In the delete options there is no option to delete all backups done before a specific date or delete backups over a certain age.

Is there a technical reason for this? If not, would you consider a PR that added one or both features? I assume one could simply list backups and check the last modified date.

[kouk]

I wrote a small script to accomplish this, might help you: http://kouk.surukle.me/2018/06/12/postgres-wal-e-delete-backups-older-than-date/