I was looking at data usage in the Data Sense app on my Lumia 920 (running WP 8.1 dev preview), and noticed that one of the entries in the list was called "Data to restore", with non-trivial amounts of data used:
What exactly is this? It sounds like this might be for data restored from cloud backups when upgrading or resetting the OS, but a) I always do this sort of thing on Wi-Fi, and b) the last time I did this was back in April (upgrading to the 8.1 preview), whereas the numbers in Data Sense are only for the month of May.
So what else can be included in this entry? And perhaps more importantly, how can I control when this happens, to make sure it doesn't burn through my monthly mobile data limit?