You will probably find these are created indirectly via the
The daily cron-job
/etc/cron.daily/zz-backup2l will invoke
backup2l, and the configuration file for that (
/etc/backup2l.conf) will run all the jobs in these two directories before it begins and after it completes, respectively:
The former will have a script in it to dump local MySQL & Postgresql databases.
Hope that helps.