lets break it down. I don't want my data (original full size photos) on the laptop It's getting to the point where I have almost no space left to actually store any more photos. I Want it on a usb drive or a network share, multiple copies. Ideally maybe you know, Apples 'backup solution' Time Machine. But it is not possible to do this in any reasonable way when your computer is a laptop. (for clarity, READ: portable device that doesn't have expandable storage, or can have permanently attached external storage)
Please, if I have missed something and it actually IS possible, please let me know! I would love to solve this issue. Tell me the way! As I Detailed in my post above, storing my photos library on a USB drive is not a reasonable or acceptable method as this means my laptop will need to have the drive permanently attached to access my photos, or I have to manage 2 sets of photo libraries with all the sync issues that involves never mind apple literally saying that 'doing this may cause data loss'
So whats your idea?
If you have multiple photo libraries on your Mac, you can choose which library to use with iCloud Photos and Shared Albums.
support.apple.com
"You can use iCloud Photos, Shared Albums, and My Photo Stream only with the System Photo Library."
To save storage space on your Mac, you can move your Photos library to a different storage device.
support.apple.com
"To prevent data loss, Apple doesn't recommend storing photo libraries on external storage devices like SD cards and USB flash drives, or drives that are shared on a network."