Incremental Backups ignore retention and never get deleted

I set up the incremental backups because they were supposed to use up less space, but they never got deleted and ignored retention completely, so they quickly filled up the server and now I have hundreds if not thousands of backups I cannot possibly delete manually.

I really need a way to automatically delete old backups and also I want to be able to adjust retention time and for it to work and do it’s job, I already had to scale my server up because of the backups using up too much space, and now it’s almost filled up again and I had to stop further backups.

Thanks in advance!