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Message: <blockquote data-quote="MacInWin" data-source="post: 1924587" data-attributes="member: 396914"><p>One of the eye-openers for me was that by default APFS stores files as sparse, which saves a ton of space. But if you then copy that file to a file structure that doesn't support sparse, it expands. He showed one example of a new, empty database that had taken up 90Kb (yes, Kilo Bytes) on the APFS drive, but which was 55 GB by design and which would expand to that fully 55GB if it was moved to HFS+, or a NAS, or NTFS, or FAT drive. What is key in that little operation is that a novice (like me) who didn't know about that might wonder why a 90KB file was taking so long to copy to an HFS+ drive. Sounds like a reason to format externals APFS, maybe even rotating drives. But that is a discussion for another day...</p></blockquote><p></p>