I'd say switching to SSD or NVMe drives would net the biggest bang for the buck, assuming the server hardware supports them. That would likely at least cut down on the amount of time things would be offline.
I think I asked this a long time ago, but what about moving to a cloud solution like Xenforo cloud and increasing revenue via donations or ads to pay for the costs? It sounds like AC is busy with his day-to-day job and his time is limited a bit. That would shift these outages to being someone else's problem to solve.
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