Wouldn't the best idea simply be to have the generator power a suitably sized 240 V UPS (Uninterruptible Power Supply), and power your computer and all the other gear from the UPS?
For a couple of hundred dollars, you could get a UPS with 1000 / 1500 VA rating, which could power all of your gear for a couple of hours, while you refuel the generator. They UPS would also have the advantage of "smoothing" the power output, isolating your sensitive equipment from any voltage fluctuations that you might otherwise see as the load on the generator fluctuates.
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