They can give you a percentage breakdown of the general categories of data usage each month by calling customer care. Beyond that they cannot give you a good breakdown without getting rather invasive into your privacy, which I am sure would cause a whole lot more outraged posts here than there are already.
The best way to take control is to follow the many recommendations found on these forums and know for certain what is connected and when it is connected. In my case 5-8 GB a month was from my wife, son, and duaghter's cell phones. Also disabled flash, video auto-start, and added Adblocker Plus on all my browsers on all my computers. Disabled all updates for windows, av and any other application. I manually run those every few days during the Free Zone.
This took me from using 10 GB in 14 days to using 6.3 GB with 5 days left. I used the internet nightly for webmail and research and even remote support on systems I need to connect to after hours.
I wish they had an hourly breakdown of usage and I believe it is coming, but for now I was able wrangle the gremlins in and so far it is working out great.
It's interesting to see what goes up and what goes down AND how frequently various programs are calling home. I used to leave GMail open when I wasn't using my computer. I don't anymore. Several times a minute GMail asks the sever if it has any new email and each time the server responds which means data up and data down whether there is email or not.
I think anytime you open an SSL connection there is constant data up/down checking to make sure the connection is still connected.
Be wary of VPNs. They are data black holes.
The other Brian's point is valid. More detail from Exede would require they capture more data about your surfing habits.
These forums have lots of suggestions for reducing the ambient load on your data connection. Try some of them and you'll probably find you can reduce your usage significantly.
If there are techies comfortable with outside-the-box solutions, I loaded an older PC with pfSense firewall software and use Squid & Dansguardian to - among other things - log usage. It will tell me which computer used how much and where they went on an hourly, daily or monthly basis. Other benefits are content filtering to put the kibosh on pornography, caching of web files to decrease data usage, and so much more.
Accomplishing this is very technical in nature but you have so much control. I do not recommend this to anyone not up for the challenge.
Absolutely Exede should not be storing detailed information that would violate your privacy. It would be nice to have the usage broken down by day or hour BUT there is a disclaimer that updates can be delayed up to 24 hours or not at all if your modem is offline. Apparently the data usage comes from the modem itself?