5 or 7 years ago when space was tighter, I'd pick and choose tracks from so-so albums to archive. Then two things happened. First, I had a few albums where I regretted deleting the rest of the songs and ended up re-obtaining the album later, which was inconvenient. Second, disk space got cheaper and so less important (relatively).
So now, I'll usually keep an entire album, even if I only like a few songs from it.
So now, I'll usually keep an entire album, even if I only like a few songs from it.