as always... whatever works. but i used to keep a lot of projects (already backed up elsewhere) on the sd card, and just moved one to the internal drive if i wanted to work on it.
something like idrive (online backup, which i use) is incredibly useful too. i remember being far from home, and unable to find a file... and downloading it from my online backup, and then getting back to work.
If I have everything on my laptop, then I won't need to carry an extra card or HD, that's my point. Having extra SD cards, then when they are full, buy new ones... we are back to the DVD era where you would have 50 DVDs with backups? Nope, not for me haha
I rather buy a 2TB disk, sell the old one, sell my old backups drives and buy 2TB drives as well.
I'm a minimalist kind of guy, I guess you know that already
The less stuff I have (and that goes back to the old thread of me loving using stock plugins instead of third-party stuff), the better. At least for me, that's what works. It helps me focus more on fewer things and make less decisions. That is how I work with everything, not just music.
When it comes to storage, I like having 1 disk with everything, I know where everything is, so I don't have to go back and forth between 2 or more storage places (either external drives, cloud services - which I'm really not a big fan of for many reasons).
But yeah, Logic doesn't offer that feature, no big deal. I can live with that.