this post was submitted on 24 May 2025
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Nutomic, one of the original developers of Lemmy explains here that overwriting your post and deleting your account will remove the content permanently. Deleting a post individually will however leave its content in the database of the instance, for recovery purpose:
https://github.com/LemmyNet/lemmy/issues/2977
However, If I recall correctly, I think that when creating a post if you upload an image then it is immediately put into the database whether or not the post is actually made. As a result I don't think there is a way to overwrite these, so some trace would still remain in such an instance if I am not mistaken.
Furthermore none of this prevents or rectifies snapshots or backups of data being created by pretty much any entity - I know that's probably not in the scope of the question, but just something tangentially related to keep in mind.
You can delete uploaded media since v.19 iirc.
There's a media tab in your profile on supported clients where you can see and remove uploaded media files.
Missed that update, that's great to know. Thanks!