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Okay, so you've decided to move your Photos library over to an external drive. If you use an automated backup service for your computer, you'll have to set up a second set of rules for backing up your hard drive.You don't want to spend the money on an external drive.Unless you purchase a speedy drive, working externally is almost always slower than working on your default hard drive.
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You don't want to accidentally create duplicate libraries that can't be connected to iCloud Photo Library (because your offsite library is connected).You use a laptop frequently and can't afford an SSD, and you don't want to risk breaking your disc-based hard drive by constantly moving it.You don't want to have to worry about always having your external drive connected to view and edit your images.You don't have a big enough library to warrant moving it off your Mac.
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