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Just like a file that is "online-only" in dropbox, which shows its original size in the ntfs system, at the same time 0 bytes on disk?

I am aware that if the file size is smaller than 1k then it is the default behaviour. I am curious how cloud syncing apps do it. I searched but haven't found any relevant answers.

Alex
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  • Not 100% sure, but I would assume low-level access to the filesystem to update the index (File allocation Table, but whatever its called for NTFS) – LPChip May 25 '22 at 11:17
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    What you are after is known as a "sparce file", the duplicate should have a few pointers. – Mokubai May 25 '22 at 11:19

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