I don’t like the fact that I could delete every copy using only the mouse and keyboard from my main PC. I want something that can’t be ransomwared and that I can’t screw up once created.
Lots of ways to get around that without having to go the route of burning a hundred blu-rays with complicated (and risky) archive splitting and merging. Just a handful of external HDDs that you “zfs send” to and cycle on some regular schedule would handle that. So buy 3 drives, backup your data to all 3 of them, then unplug 2 and put them somewhere safe (desk at work, friend or family member’s house, etc.). Continue backing up to the one you keep local for the next ~month and then rotate the drives. So at any given time you have a on-site copy that’s up-to-date, and two off-site copies that are no more than 1 and 2 months old respectively. Immune to ransomware, accidental deletion, fire, flood, etc. and super easy to maintain and restore from.
2-4G for swap (more if you want to hibernate), the rest for /. Only add a boot/EFI partition if needed.
Over-partitioning is a newbie mistake IMO, it usually causes way more problems than it solves.