File → block chunks

Every file split into 4MB blocks. Each block hashed (SHA256). Same hash across users = same block = stored once.

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File → block chunks

Every file split into 4MB blocks. Each block hashed (SHA256). Same hash across users = same block = stored once.

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Delta sync

Change a byte in a 100MB file → only the affected 4MB block re-uploaded. Everything else re-linked.