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I am typing this on a vintage Apple machine (iMac 15,1 from 2014) which features a Fusion drive. This means that its main internal HD is actually a 1TB spinning-disk HD combined with a 120GB SSD.
About March this year, this machine suffered repeated crashes (at intervals of 1-2 days). Long phone calls to Apple support later, the solution was: [1] all user data was backed up to Dropbox (which I was using anyway in the background to get my various machines to talk to each other); [2] delete the internal HD completely, and reinstall the system from Apple's Internet recovery system; [3] manually recover about 5 days' emails which got lost in the middle but which were captured on other machines.
It turned out that the SSD had failed completely, but the spinning-disc HD was - and is - still in full working order. The machine now runs on just the spinning-disc HD. It has now gone over 80 days (and 3 system updates) since its last crash.
Biting the hand that feeds IT
