WSL Export and Import

Export
wsl --export <Distro> <FileName>
e.g.
wsl --export Ubuntu-20.04 C:\BAK\Ubuntu-20.04.tar

Import
wsl --import <Distro> <InstallLocation> <FileName>
e.g.
wsl --import Ubuntu-20.04 C:\WSL C:\BAK\Ubuntu-20.04.tar