how can i back photos from my computer to an external disk
How can I back the photo library from my Mac computer to an external disk
MacBook Pro 13″, macOS 11.2
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You can simply copy the Photos library package from your Mac to an external disk. Just make sure the external disk is APFS formatted and is a connected USB drive. DO NOT use a NAS drive as it is not compatible.
Alternatively you can also export all of your photos from Photos into normal folders (these can be stored on a NAS drive).
I actually do both as the JPEG exports are also backed up using an online provider (the Photos library cannot be backed up using an online service like Crashplan).