It’s can be a useful server with a built-in UPS if there’s any services you’d like to isolate from the rest that you’re running. One example is backups as you want a backup system to be fairly well isolated but anything sensitive would qualify.
You could also make use of it for purposes where the hardware can speed things up, I think that GPU could help with encoding etc.
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Things like Freenet or ipfs where your node doesn’t provide just networking but also storage.
Could be too obvious to mention here but a fediverse instance of some sort, lots of different software you can run besides the usual suspects like Mastodon or Lemmy/Kbin ranging from the more niche microblog platforms like Misskey forks (writing this on a Sharkey instance) to things like Bookwyrm for tracking your reading habits and connecting with other book lovers.
Distributed computing like distributed.net or Folding at Home.
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