How To Back Up Your Skype Chat History On Windows 10

In the Search box on the Toolbar type Run.
Click Run in the search options.
Type or paste the following in the run dialogue box: %localappdata%\Packages\Microsoft.SkypeApp_kzf8qxf38zg5c\LocalState.
Click OK to open the location. Note: You can also browse to the folder path in File Explorer.
In the File Explorer window, open the folder with your Skype username.
Select the file main.db.
In the toolbar on top click Copy to.
Select a location to take a backup of the file.