I had an issue with exchange services, which might or might not be related. When I looked at my data usage, it had downloaded 500 Mb of data, a huge amount. I ended up having the service only run on Wifi, and that seems to have solved the problem. I am not sure if the issue has to do with the backup of the phone to Google, but I cannot imagine it is due to emails. If it is a backup issue, it is a little infuriating that being mostly on Wifi all the time (have it at work), the phone would still need 500 Mb of 4G connection.
