KDE Connect for the win.
@lemmy.lemist.de
This will differ greatly from instance to instance. The people running lemmy.world have published some info on their infrastructure. My instance is running on a rather small VPS with 100GB storage, but I will have to rethink my solution rather soon as images and videos from my subbed communities [Edit: which are stored on outside sites] are eating around a gigabyte per day and I think this is likely to increase.
Edit: I want to clarify that I was partially wrong - Lemmy only locally caches content which is hosted on outside sites (e.g. imgur). It does not cache content that was directly uploaded to another Lemmy instance and just embeds the source media.
In addition to the online platforms linked by the other commenters, it's also pretty straightforward to run Stable Diffusion locally, if your hardware is beefy enough: https://github.com/...
Various fine-tunes checkpoints for different content and art styles can be downloaded at civitai.
Das ist auch für mich der heuchlerischste Punkt an der Sache. Ich finde die Einschränkungen eigentlich alle sinnvoll, aber könnte die nie ernsthaft verteidigen, solange man quasi überall Zigaretten rauchen darf.
"support Lemmy" only covers the project itself. If you want to support the people hosting your instance, you have to contact them. Individual instances may have links for donating in their sidebars.
As you're on lemmy.ml, an instance hosted by the Lemmy developers, I guess in your specific case using the linked page would be the right way to support your instance.
thanks for using Leebra!
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