This can be done on any USB storage device large enough to hold the data you want to backup.
You can’t play games from a backup drive, but you can keep data safely stored locally, which will come in handy if your PS5 ever suffers a hardware failure or memory corruption, and could free up extra space on your PS5’s internal SSD.
So, once you have a PS5-compatible hard drive, it’s time to get it ready to use as an expanded storage device.You can also set PS4 games to be automatically downloaded to the external drive by going to Settings > Storage > Extended Storage and toggling “Install PS4 Games to USB Extended Storage.â€