Auto backup before every update stopped working

I had notifications this morning of some updates but noticed they didn't say that the backup had been done first

So i went to my hub and have found that all my switches for Auto backup before every update have been switched to OFF

no notifications of any backup failures

no notification that backups have been disabled

they have just all been switched off

And I can't switch them on – i switch on, save, and then check to see they are still off

can someone investigate and explain why this has happened

regards

ian