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Yes - they're already on my computer, so any full-disk backup service will back them up by default. There's an option to purge them from disk and download from iCloud on demand, but you don't need to use it: https://support.apple.com/en-us/111762
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ah fair, I was thinking on the iphone, but in fairness this is a thread about a laptop
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Even on an iPhone you can back up your library to Google Photos or other services. You just can’t do so directly through Apple’s Photos app.
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It's different on mobile (iOS/Android) where individual apps need special support for cloud providers. On a mac everything is just a file for most apps, so all the cloud providers work by default.
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