Deleting in Convoro almost always means soft deleting: the row is marked rather than removed, it stops appearing anywhere on the site, and Admin → Deleted content can put it back.
That covers topics, posts, blog entries, events and gallery images, and it takes their comments with them in both directions.
🚨 Uploaded files are deliberately not removed by a soft delete. A restore that produced a page of broken pictures would be worse than no restore, so the bytes stay on disk until something removes the row for good.