Forum OpenACS Q&A: Response to Community Bid: RPM's for RedHat

if you upgrade a customized product you'd never use RPMs, at least not to my knowledge. RPM's are there to get you started. We might though have this .rpmsave functionality with an upgrade, that would identify files changed from the former RPM and save them to a special file with a .rpmsave extension. But you'd not use CVS either, because this would not work well with your changes.

I think upgrading should be handled by the APM, but that's just my gut feeling.