It's kind of like asking how you can build a server that will last 30 years without maintenance. There are a few examples of long-running servers around, but they've all had lots of parts replaced - but how about Voyager 1 and Voyager 2?

A well-shielded server on a spacecraft in a distant orbit (maybe around Mars) hooked up to the Deep Space Network, powered by satellite solar panels - that might be the ticket.