Where is the clipboard stored in an iOS backup? I have a recent backup of my iPad. 

Where can I find the clipboard in the backup ?

I know that the clipboard is kept between restarts. So I think — and hope — that it is stored somewhere in backups.
And there are backup viewers, like iphonebackupviewer
(haven't used) ...google for same, download trials and see what you like. But I don't see clipboard mentioned, and haven't seen it when I've viewed backups in the past.