Please follow the below guide on how to backup bookmarks and passwords in Edge:
Bookmarks:
Step 1: Open the Edge browser, and click the menu icon (three horizontal dots) in the upper right corner.
Step 2: Navigate to Favorites > Manage favorites.
Step 3: In the right pane, click the menu icon (three horizontal lines) that’s located directly above the list of favourites.
Step 4: Click Export favourites.
Step 5: Select a location to back up your favourites, name the file, and click Save.
Passwords:
Step 1: Open the Edge browser, and click the menu icon (three horizontal dots) in the upper right corner and select settings:
Step 2: in the settings menu, select passwords:
Step 3: In the passwords window, select the 3 dots and click on export passwords:
Step 4: you will be prompted to confirm your identity, please enter your password.
Step 5: Once verified you will be asked where you would like to save your passwords. (Please note, your passwords will be saved in plain text, ensure they are saved where no one else can access)