A bulging Photos Library that consumes 30GB of iCloud storage has led Sante Kotturi to want to offload all their current images and videos, and start fresh. But Sante wants to store the existing media securely and for a long time.
I thought of just copying the Photos Library file in User/[me]/Pictures onto an external drive, but this runs into a problem if you try restoring it after changes to macOS Photos make the file format incompatible.
My next thought was to export all 7,000 photos and videos, and then delete all the photos. Wait for iCloud photos to sync, which will probably take the full 30 days for deleted photos to disappear.