I accidentally overwrote my 9.3.3 beta 5 backup as I didn't realise that creating a backup of iOS 10 would automatically delete all previous backups. Stupid iTunes, it doesn't give any warning about that.
No big issue, I've just had to revert to 9.3.2 and will have to wait until 9.3.3 is officially out as Apple no longer appear to accept the iOS 9 beta profile.
Lost my backup but it just means I will have to sync the iPad back up to iTunes to get my music back. And I just have to reinstall all my apps. There wasn't really much else on there, everything is linked to online accounts these days so I didn't lose anything important.
I'll jump back on the iOS 10 bandwagon when it's a little more stable