The amount of data sent to our servers depends on what you decide to track and how often.
If you set the basic options and collect only basic data then very little data is transmitted, however if you track 100 features then alot more data is sent.
Also, it depends how often your applications are run by users and many other variable as to the amount of total data we collect on your behalf.
The "good news" is that we don't charge for data amount, type, the time we hold or apply those forms of quotas unlike the competition so you don't have to worry at all about the data limit.