It's really not that hard to keep computers non-crashing, as long as you have good hardware and run a limited subset of software.

Many servers I've owned had multiple years of uptime, and the only reason they'd go down is because they will get decommissioned or because of power outage.

The article says:

> disk drives, power supplies and some other components have been replaced but Hogan estimates that close to 80% of the system is original.

so I am guessing there was no reboots, nor CPU replacements.