Is there a solution for saving less logs with ADSelfService Plus?

After a couple of months the ADSelfService Plus\logs\ folder was over 1,5 GB in size.

Most large files:

access_log.txt

serverout.txt (multiple files with numbers)

ADSMlogger.txt (multiple files with numbers)

We would like to save less logs as we need to pay extra for additional disk storage with our server provider.

Thanks in advance.

Marc