There are several very clever ways around this, with continual rolling updates in a general fashion with only static files. Not static per user, but basically

There are several very clever ways around this, with continual rolling updates in a general fashion with only static files. Not static per user, but basically giving (source + diff + diff) on a daily / weekly / monthly basis allows you to only download a diff based on the frequency which you connect. Hell, at this point, just git-clone a repo/data structure (potentially with an initial shallow clone since you may not care about history) and roll forward "as good as git"