I once had a DVD recorder, but during a lightning storm, it was destroyed. :ack: At least the TV and everything else plugged in the same survived. Still, it hasn't been replaced and there are times when I want to record something and I'd rather have a more permanent recording than an aging VHS tape.
1. Yes. I can't quite remember how, but maybe if you didn't finalize the disc, you could continue recording other things. My DVD recorder made a menu for the things it recorded. I recorded "Good Burger" on to DVD from VHS, and it has a menu. And just for one item. I don't think it's like a VHS where you can accidentally record over something, unless you want.
2. DVD. Recordable DVDs won't last as long as commercial DVDs, but they'll last longer than VHS tapes.
3. I guess. If you record multiple episodes of a single show and it makes a menu, you could make a DIY "season set".