The automatic copy of the database created every 3 days currently grows unbounded. Most software that creates automatic database dumps compresses the dumps and keeps a set number.
As an example: My database is 175MB. I had 30 backup files going back 90 days. This consumed 5.25GB. If I compress these backups, each one drops to 28MB or a total of 0.84GB. If they were compressed and rolled off after 30 days we would be down to an acceptable 280MB used.
