iCloud Backup
MY Imac/iPad devices won't allow me to do a Bsck up due to insufficient storage. It states I require 3.2 Gb and I should try various options to meet my allowance and yet my iPad suggests that I have 4 Gb of storage spare, why then can I not backup?
iMac (21.5-inch, Late 2013), OS X Yosemite (10.10.3)