I store my gear in a fire resistant gun safe. Honestly, I don't have a lot but if something happened to them, it would take me a very long time to rebuild my collection. I couldn't live with that. And the safe is obviously good for other things such as, well, firearms.. but other things like jewelry, watches, documents, old photos, etc. I think they're worth every penny. And don't forget to bolt it down. An unbolted safe will get wheeled out of your house guaranteed. OP has so much equipment that this might not really work lol.
I was thinking about getting one of these worksite tool chests for other valuables. Bolted down of course.
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They're $200-$300 I believe.
Construction guys use it to lock their tools in overnight on sight.
6D ☺ G7 X Mark II ☺ SL1 ☺ EF-S 18-55mm f/3.5-5.6 IS STM ☺ EF 28 f/2.8 IS ☺ EF 85 f/1.8 ☺ Rokinon 8 f/3.5 ☺ EF 24-105 f/4L IS ☺ EF 70-300mm f/4-5.6 IS ☺ EF 50 f/1.8 STM ☺ EF 24-70 f/2.8L II