"Which could be on a single hybrid drive."
And thus a single point of failure if not backed up to an external device.
I am still on spinning rust but my next machine* will be all SSD for speed and physical shock resistance.
Apart from the big-iron exchangeable disc packs (8MB) my first hard drive was a 5MB Winchester on a CPM machine with 8" floppies, the HD replaced one of them. 1980 IIRC.
*assuming I outlive this one!