Hi and thanks for reaching out. My name is William. I'm a Windows technical expert. I'll be happy to help you out today.
Enter the following into the address bar edge://favorites/. Select the ellipses (3 dots) on the right-top > Export Favorites. See attached image for example.
Alternatively, you can just copy the bookmarks file into a secure location and restore later. It can be found as bookmarks file in %localappdata%\Microsoft\Edge\User Data\Default.
Another method is to sync your favorites with our Microsoft account. In address bar paste edge://settings/profiles/sync and select options for Favorites then Confirm.