Gnome Nautilus bookmarks/favorites backup (in Ubuntu)

Nautilus (default file manager in Ubuntu) saves bookmarks/favorites in the following file in the home folder:
~/.gtk-bookmarks or home/YOUR_USERNAME/.gtk-bookmarks

You might need to make hidden files (those that starts with a .) visible by pressing CTRL+H in Nautilus in order to find the file.

Just copy the file to another location to make a backup of it 🙂