Multisig requires the x/y/z Keys to be backed-up too, correct?
Yes, that's right. The public keys themselves don't grant permission to spend of course, so you can make many copies.
A multi-sig backup scheme could look like the following:
1: HWW #1 + Seed #1 + xPubs #1, #2, #3 2: HWW #2 + Seed #2 + xPubs #1, #2, #3 3: HWW #3 + Seed #3 + xPubs #1, #2, #3
Where the seeds and xPubs are stored on laminated paper.
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