As far as I know Lemmy stores only text locally and images and such will be linked to the external instance. Text doesn’t use much disk space, so that shouldn’t be a big a problem. Sometimes when you browse Lemmy, you notice posts that have broken links to images. It’s because the other instance is down, but you can still see the text portion of the posts on your home instance.

I managed to visit when the server was 0.18.1-rc. I didn’t see any posts and the selector for Subscribed, Local and All was “empty”, as in nothing was selected and I could not select anything.

r/Blind mods created their own Lemmy instance at https://rblind.com/. They use some beta features and their own modifications to make it more accessible.