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Staying out of the water for 24 hours is obviously a safe method.
If none of my recent dives were beyond NDL, my dead computer backup plan is simply to assume that I surfaced from my last dive as pressure group Z on the PADI RDP and plan my dives using that table. Since I wasn't in deco, then I'm within limits on all compartments of the deco model, including the 60 minute compartment used for repetitive groups on the RDP.
I would start wearing my backup computer at that point, but would use the tables to set my bottom time until after an overnight break. At that point, I would start using my computer to plan dives.
You should use all of the available information to check the validity of your intended dive plan --- that includes things like what your buddy's computer says (taking into account your relative depths on previous profiles).
Extending your safety stop will add additional safety margin.
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