I stood up a Yunohost and installed Mastodon a few months back. I had issues with storage and exponential growth as a result of federating with other instances.
It was just too much work keeping the storage at a minimal level for a single user instance, so I ditched it.
Is there anything like that I need to consider before I try my hand at Lemmy?
Cloud storage is expensive. Physical storage is cheaper in the long run. Might be a good candidate to actually self-host on-prem. Throw a bunch of SATA SSDs at it, which are astonishingly dirt cheap nowadays and probably fast enough for a medium-sized instance; maybe add an NVMe disk cache if you want to be fancy.
One of these months (or years…) fiber will finally be available in my area, at which point I’m going to move most of my servers from the cloud to on-prem. But for now I can’t, because 10 Mbps upload is a pretty tight bottleneck…