Seems like there's a trade off in resource usage re: git vs rsync

Rsync seems to be relatively cheap, but has a fixed part of its overhead.
Probably one of the reasons that you get temp-banned from the mirrors if
you sync too often.

Git overhead appears ot be higher on the variable parts but lower on the
fixed parts, and from what I gather, the more often you sync, the lower the
overhead.

As far as changelog generation, what about causing the changelogs to be
autogenerated by the end user's computer?  Divide and conquer.