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You can dump them all via the iCloud.com website if you so desire, the iCloud software on Windows can do the same.

Alternately use Google photos w/ google drive subscription.

Which they removed a few months ago.

They just removed photos showing in drive, you still get unlimited photos/videos in original quality with a drive sub.

You can't sync your photos into drive, which is how I backed them up, using the `drive` commandline tool and then `s3cmd` to make another copy.

Sync to local storage, drag and drop, sync happens to other cloud.

Have a Mac running set to sync all iCloud content locally. From there you can manually access all media or automate sync/backup to some other service.