I just noticed about 60% of anime OPs and EDs have been taken down on Youtube.
Haven't used Youtube since August 2015, I was too busy watching shows. But now that I'm not so busy, I went back to Youtube to listen to some of my anime OST playlists only to find out that they were taken down.
It's trivial to do the other way around. Download the whole album and figure out which songs are worth keeping.
Sometimes I download an entire discography in the search of a single song. *That's* a pain in the ass.
>100 anime OST collections let's say about one gig for decent quality
You're listening to them on youtube, so I doubt you care about quality all that much.
100 MB per album should be plenty.
That leaves you with 10 GB for 100 OSTs.