if i erase items on iMac, does it erase items already store in iCloud?
If i erase files on my iMac that are stored in the cloud, are they also erased in iCloud?
iMac Line (2012 and Later)
You can do all of the steps in the following and it will not affect your data on iCloud or on other devices: What to do before you sell, give away, or trade in your Mac - Apple Support