Symlinked media folder is often used for high availability clustered setups where mounting the shared resources (such as pub/media) amongst multiple physical machines.
Using media storage default (file system).
Create /mediastorage folder.
Unzip and go into the pub directory of the tar archive.
media folder should not be a simple file. The backup routine should acknowledge the media folder as a folder and zip the actual folder.
Media folder is a file ( and not a folder ).

I think this is how the 'System Backup' is supposed to work. When you put it back your symlink is there again.
Now for the 'Database and Media Backup' you might have a point.
I Agree for the "System Backup" - which essentially should copy the installation from the root folder. However, I used "Database and Media Backup" and expected that the contents of the media folder would be backed up.
This is quite important issue. The "Database and Media Backup" does not work atm. It seems just like a "System backup".
Yeah, we have this issue as well. It would be great to have the option to "Follow Symlinks"
@peec Hello, can you check your problem on the latest version Magento 2? I can`t reproduce it
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I Agree for the "System Backup" - which essentially should copy the installation from the root folder. However, I used "Database and Media Backup" and expected that the contents of the media folder would be backed up.