Once you find the savedata.bin file, simply copy it to a secure location. Unlike the Steam version, which uses a specific numeric ID folder , non-Steam saves are generally easier to move between computers as they aren't always tied to a specific account ID.
Finding your Resident Evil 6 save files on a non-Steam version can be tricky since different releases (like various digital stores or older physical copies) store data in different places. Where to Find Your Resident Evil 6 Save Files (Non-Steam) resident+evil+6+save+game+location+non+steam