@brunty It's as toss-up between my Mastodon instance and Ceph.

For Mastodon, it's simple: I can self-host my own social media platform, how cool is that?

For Ceph, it's just the "huh?!" factor. When you first look at it, it seems to require a 5 people Ops team. But once you've set it all up, it is extremely low maintenance and supplies me with disk pools I can use for block devices for VMs, S3 for all manner of stuff and a shared networked FS with CephFS.