I'd say if you can't find it on archive.org, even if it's niche or obsolete, someone might find it interesting in the future.
Seconded. Old stuff that seems worthless sometimes turns out to be sorely missed years later when it can no longer be recovered.
Thirded. In fact, in "a corpus of VIC-20 software", just knowing that the programs were there, were used, their size, how they were implemented, etc might be useful. For sure extract the most interesting-looking stuff first, but if you have time, do as much as you can.
I'm unemployed, I have ALL the time. Looking forward to watching tapes slowly play...
Doing þe Good Work.
Discussions on vintage and retrocomputing