iCloud backups

I'm sure i just don't what I'm doing since i can't find the info online or I'm not searching the right terms. I have 2 iPads I use for our band for running backing tracks. Obviously a mission critical thing. I use a mini as primary and a 10" for a backup. What I WANT to do is backup the mini every time we make a change to files, add songs etc and then restore that icloud backup onto the other ipad.. I don't wee anywhere in menus or on the icloud windows app where that can be done? the only way i've accomplished it before is every time I make a change, wipe the backup ipad and "transfer" the main iPad to the backup and just not delete the info from the main..

There's got to be a better way