This is how I did migration: https://www.gulshankumar.net/discourse-forum-server-migration/
Did the he forum appear to work before you restored the backup?
You have images stored locally and not in S3?
Does either site have a cdn?
If you click the wrench on a topic and rebuild html does it fix the images?
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My images was locally (default state)
I was not using any CDN.
Tried rebuild and rebake as well but didn’t helped at all.
I was using S3 only for backup purpose. But for the sake migration in lowest possible cost, I created a local backup which I did scp. I have done similar and it used to work not sure what wrong this time happened.
Is it all images or just things that need to be resized like avatars?
You did a full backup with uploads, or did you try to move the uploads separately?