BuddyPress.org

In the process of running through all potential website concerns during the development phase I have recently pondered the unpleasant thought of users uploading large size avatars.. bloating up the database size. So my question is how can we control or set the upload size limit for avatars?

Just to give an example 10k users upload a 1mb file that is 10GB which would be a pretty scary backup especially since I feel I will have more users than that..

Also where are the avatars being uploaded to? I can not find any directory for them..