Signing Off On iCloud without losing anything

I am about to give my son my desktop that is loaded with music software (Arturia, Native Instruments, etc.) but want to get rid of all the iCloud connections that it presently has with my other computers and phone. I imagine the easiest way to do this is just to remove the desktop's access to iCloud, and delete the info (bookmarks, contacts, photos, etc.) - Silly question, but deleting the access of this computer to iCloud should have no affect on the information (such as bookmarks and contacts) on the other devices - is this correct? I am 99% sure it is, but MAN! I would hate to be wrong. There are notes, contacts, photos, bookmarks that go back 15 years, so I decided it was worth being over cautious - Am I correct about this? Thanks in advance! Ricky