iMAC data deleted by iCloud
All I would like to do is close iCloud. But when I do it deletes contacts, calendar... from my computers. Why am I not able just to cease using iCloud and keep the data I have on my systems? It should be simple but Apple has made it extremely difficult and troublesome.
iMac (21.5-inch, Late 2013), OS X Yosemite (10.10)