Backup parts

So im looking to possibly put a couple backup parts on the shelf. Power supply being one of them. Is that even necessary? Every unit has a redundant. Im thinking about the possibility of a backup hard drive more than a PS. IS that an available part?

T

Personally I don’t know of any PSU’s from the D Live range that have failed, true I do fit redundant units to all my D-Live stock but this may be me being over cautious.
To the best of my knowledge there is not a hard drive in a D-Live there certainly was not in the iLive.
Not sure if this helps?

fdisk runs after a power drop… worst case scenario
I guess there is a flash drive used instead a hard disk