Q: Where else is the "Encrypt iPad backup" setting stored?

Thanks Steve.  That's the place where it became ticked all by itself and I don't know the password!@#$ 

There is a bit more history to this problem.  Once upon a time we had our first iPad 2 (A) and I did tick the option to encrypt the the backup with a password.  However when the iPad (A) screen became cracked we got another iPad 2 (B) to replace it.  When attempting to restore the original iPad 2 (A) backup onto the new iPad (B) we came across the password problem not knowing what it was.  We got around the unknown password problem by manually backing up iPad (A) using a great bit of software iExplorer and was able to restore onto iPad (B).  Learning from our previous mistakes we decided never to "Encrypt local backup" ever again.

Our new iPad (B) was working fine with no tick against "Encrypt local backup".

However some time later I think iTunes or maybe iCloud (if iCloud stores it too? unknown???) has gotten confused between iPad (A) backups and iPad (B) backups and restored the tick to "Encrypt local backup" onto iPad (B).

I could go through the process to manually backup iPad (B) using iExplorer again and then setting up iPad (B) as a new iPad and restore the manual backup but I'm worried the the tick to "Encrypt local backup" will return!

iTunes has appeared to turn on / tick the "Encrypt iPad backup" setting all by itself. How can this happen? Where else can it be set?  How can I stop it from returning again?

A few months pass with iPad (B) living in fear of not being able to restore a backup due to an unknown password that was never set with iPad (B).  Well the screen of iPad (B) is now cracked (teenagers!@#$) so I wish to remove the tick for good this time.

I'm in the process of backing up App data using iExplore again (great software!) and will restore to a new iPad.

I've checked iCloud, via Control Panel / iCloud and there are no devices backed up.  I've now removed all backups from iTunes of iPad (A) and iPad (B).  My fingers are crossed, so the tick should never come back...

I think the "tick" is gone forever.  Wahoo!

The tick has returned!@#$

I'm not going through this process a third time.  There is a definate bug in the iPad / iTunes software.