Earlier quoted context omitted.
I didn't know you could do that! I've only been using it as intended.
On most (all?) kobos, you can also upgrade the storage to whatever you want because it’s a microsd card slotted into the board. Just copy the system partition over to the new sd, expand, done. Mind you, I never needed to do it because 4 or 8GB is a ton of ebooks. I’ll probably never need that much space anyway. But if you’re reading larger files, might be handy.
Nah, that's no longer universally true. Pretty sure the Sage and Elipsa use soldered eMMC storage instead of micro SD.