I think your browser changed the extension of the backup when you downloaded it. To fix it, you only need to change the extension back to “.tar.gz”.
As for the uploaded backup not showing up, you’ll need to make sure sidekiq is working by checking you.discourse.org/sidekiq/scheduler and making sure there’s no warning about sidekiq being paused.
The site settings are indeed saved in the backup. Due to how we cache them, you’ll need to restart the application for them to show up after a restore.
I’m glad you brought this up because I think I ran into the same thing. Not sure why downloading from Amazon S3 somehow replaces .tar.gz file extension with just .gz … very odd.
@zogstrip should we accept both filetypes here? Is that safe, I have no idea.