"Lost" media you found on your own

Unfortunately, since it didn't survive the MySpace failure merger two years ago, it just barely became entirely lost for good since backing it up myself. I can only hope the band still has their masters to be safe, since they had at least three other songs on their page, too. As far as movies go, I've probably come across a ton over the years on YouTube. I know one of them, The Basement (1989) was lost for over 20 years until it was picked up by Camp Motion Pictures for distribution after it was abandoned by the director. But, I don't think that counts since it was rediscovered. There's obscure shockumentaries I came across recently (box art only this far) that presumably never got released outside Japan and are extremely rare to where outside the uploader, I haven't see. A single collector or anyone who knows about the subject thoroughly has mentioned them as existing.

July 2022 Edit: A few months ago, someone found a promotional music video for the film featuring the band The Heartbeats. It's still on Youtube and is the best quality version we have of the song apart from the master copy. It's officially backed up on Archive.