Legacy modes that may have worked fine with Windows 7 may create installation or hardware issues during or after the installation of Windows 10. External or secondary drives would be good choices as locations to save these types of images. A better option would be to additionally or alternatively create an entire system backup image using a utility like Acronis True Image or Macrium Reflect so you can simply restore your previous installation to its exact self if something goes wrong or doesn't work out later on.
Create a backup of any important files and folders to an external source or cloud service.
Download and save these drivers to a suitable DVD, flash drive, or external disk so that in the event you need to install them later, you can do so without needing to go find them when it's no longer convenient.
