I'm on 8.1 using the Pangu JB and my 6 Plus hasn't been backed up in 2 weeks. I tried restarting my phone but it still won't backup. Is Apple detecting my JB and preventing me from backing up to iCloud?
there is a new winterboard update that fixes a icloud back up issue where it would not back up, not sure if you have winterboard installed, but if you have check cydia for the update and see if it fixes the problem