Strange .bak folders

Hey chaps!

Around 50MB of files seem to be added daily in /usr/local/cwpsrv/var/services/, it's slowly eating through my drive space.
Could anyone please share some information on what the use of these _____.bak folders are?


If they are useful for the system, is there any way of limiting them to ..maybe two days history?
If they are not useful to the system, is there any way of disabling generating them?

Thanks in advance!

those are only old phpmyadmin versions, you can delete them