Having messed up an upgrade, I realize I do not understand all the LMDE upgrade paths. When I installed LMDE about 2 years ago, I believe it upgraded from the Testing repo. At least that's what I think the sources.list said. At some point I became annoyed with the large number of apps upgrading brought in every week or so. Probably w/o fully understanding, I read that changing the repos to "incoming" would result in fewer apps upgraded. This seemed to work fine. But as I said, my UP5 upgraded failed. So I don't really understand the difference between Testing and Incoming.
Does Incoming mean fewer apps updated most of the time, and then some huge Update Pack happening from time to time? Isn't the basic LMDE iso install based on Testing. Is there an iso based on Incoming. Can I easily change from Testing to Incoming just by changing my apt sources? I like LMDE, but I'm confused about this.