ICloud backup for contacts and Exchange server

I have my iPhone and iPad synchronizing to an Exchange server at work - this is where my calendar, contacts, and email live.  I'm wondering about this "backup to iCloud": if I do, how does this work? What I can't have is another set of contacts/calendar data somewhere that might someday get pushed to my phone and from there *back* to the Exchange server - I've had this problem before and I can't afford to have the correct "master copy" of the data messed up by synchronization from anywhere else.  On my iPhone, when setting up iOS5, I didn't disable it, and how when I try to turn off synchronizing contacts with iCloud, it says something like "there's a set of sync data on the phone, delete it?". I don't want it to delete anything that will affect the contacts (etc.) that was correct on the phone, and might get pushed to the Exchange server and delete stuff from there.  How will this work and what exactly gets copied to/from iCloud with respect to these things?

+1... issue started with 10.10.1... very annoying as now all iMessage contacts are showing with just numbers...

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