For me a single 2TB 2.5 inch external HDD in a shockproof case and a 1TB SSD contain all of my most important data (mostly scanned documents and personal media like photos, phone backups and letters). I have a Syncthing folder which syncs to my phone and is mirrored to the SSD once a week, while the HDD is used as a restic target. I don’t want to lug around 3kg of disks when my house is on fire, war breaks out or an axe murderer chases me.