If I understand correctly, I’ll try and answer that.
With the content that is in the content folder for the Vault. You can back those up as “clean” versions that have not been edited. You cannot, however, copy folders into this and have them show up in your projects or vault sections of the launcher. You can however copy anything to or from the Unreal Projects folder and drop in at anytime then restart the launcher and it will be the library.
This may seem cumbersome or counter productive. This is something our team is aware of and are continually making changes and upgrading. 