Can you back up one icloud account on more than one device?

My iphone 6 broke yesterday and we can't get it looked at until the 18th (todays the 13th) so i decided to use my old phone (iphone 5). I couldnt remember the passcode to that one and had to restore it to factory settings. If i back up my icloud account onto my iphone 5 could i still back it up onto my 6 if it has to get wiped too?

This might not be possible, as some of the settings such as wallpapers and music are only able to be restored on a same device. As you want to go from ip6 to ip5, I would recommend backing up to iTunes on the PC/MAC.

If you're device is wiped during repair, you can restore everything back at a later date.