at 3.06pm Saturday? Not a time I would expect. Have a missed a notice about this?
Now back, thanks.
Not a maintenance mode I knew anything about - I was at a trade show at the NEC. The only way I can think of is if someone manually triggered a backup, but if they did, they didn’t ask or warn me.
Thx for responding, Chris 
The location map to the right of the observations has gone blank over the weekend.
A bit of security software decided to change a setting without warning.
I have fixed it.