Disk space used is always greater than actual file sizes because disk is written to in blocks. The size of the blocks is fixed and is determined when the disk is first formatted. When each file is written to disk, the beginning of the file will align with the start of a block and it will span however many needed blocks it takes to store it. The last used block will most likely have left over space that cannot be used for anything else and that's where the apparent discrency in size arises.
Yes, bandwidth is determined by actual file sizes, plus the TCP overhead.
If the tour converts, it's just the right size.
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