Uptime for home users is useless. More important is recovery, reboot and resume (the 3’Rs)

You server should reboot automatically, storage should restore itself from unsafe shutdown and your services should resume operations like nothing happened.

This means test your reboot, ensure stuff doesn’t break, and so on.

Failing storage after an hard reboot is the hardest.

For network, i have two ISP connections and a an auto switch script Incase one goes down. But honestly it’s overkill and not needed for 99% of home hosters.

Buying some kind of UPS like a battery powered power strip is also nice but keep in mind that require maintenance to replace batteries once every few years (long enough to forget) and so be useless. The ups shall only last enough to perform a controlled server shutdown using NUTS.