Sorry Tolomir .. I've recommended TouchCopy before for backup but I forgot it does not do specific backups of contacts and calendars.
There is NO way to specifically back them up.
Apple assume that everything on the iTouch or iPhone is already on your PC/Mac and therefore the backup is supposed to be on the computer rather than the iTouch. This is a bit of a pain in the a** because it does not allow for music, apps purchased via the iTouch.
Afraid there is no iTouch cloning tool out there where you can backup the contacts/calendars easily.