Given the limitations of the PS5's internal storage, an external USB drive makes a lot of sense. Here's what you can and cannot do from an external drive.
You can now backup PS5 games to an external USB storage drive
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How to Use an External Hard Drive on PS5
How to Use an External Hard Drive on PS5
How To Export PS4 Games to PS5 with a USB External Drive
How To Setup External USB Storage On PS5
Using an external USB drive with a PlayStation 5
PS5 games take up a ton of space. Here's how to boost your PlayStation 5 storage - CNET
How to manage PS5 storage as it starts to fill up
Seagate Gaming Hard Drive HD 2tb for PS5,PS4 in Ikeja - Accessories & Supplies for Electronics, Dinocent Global System
Will My PS4 External Hard Drive Work On PS5? [Full Explanation] - Alvaro Trigo's Blog