I have just checked my usage on VMBU and today is showing (roughly from memory):
Total Usage 520mb
I don't dispute the total usage, that is the correct figure. I updated headers and downloaded about 350-400mb on usenet this morning. However, this was all before 8am as that is when I leave for work. My computer is switched off and my router is encrypted and secure (besides the total usage is correct). Is there a known problem with this. Its happened to me before when I was running p2p and was told it was peers still transmitting traffic, however that cant be the case here. I am a bit concerned. I will raise a ticket if it isn't a know issue :?
Some others have noticed problems with the timing used today, see this post and there are some known issues (it seems) with the exact triggering of things at the moment. It's said that automation will help resolve this over the coming months but if you're concerned I'd raise a ticket.