I usually save the threads I post to, in HTML format only, on my HD. When I had only a set of 1 & 2 Gb HDs, I used to have to go and compress the messages, pulling out several KB each thread of excess blank lines (which HTML ignores) that are automatically generated.

But now with my much larger HDs on my new machine - wait on, what was that message - Oh, I'm running out of disk space - be back later....