unless Backblaze is smart enough to realize that the data hasn't changed, only the directory tree.
Our software contains a process called "deduplication" where files are digitally fingerprinted (checksummed) before they are sent to the server. When a file's fingerprint (SHA-1 checksum) matches an already backed up file, but it's renamed or moved (including drive to drive), it's simply updated at the servers, rather than re-transmitted.
Such technology can save a lot of people upload time too. Think of all the common files we all have on our machines. The same version of a browser, or the same music downloaded from SXSW. Only one person has to upload it, everyone else simply gets the reference added to their account. Or for my two machines, duplicate personal files between them only crossed the wire once.
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