dd and similar programs can do a byte for byte copy of the data, down to the blank space irregardless of file system.
But I've generally found it ineffective for backup purposes unless you really want to clone things.
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My Journal
Thou shalt check the array bounds of all strings (indeed, all arrays), for surely where thou typest ``foo'' someone someday shall type ``supercalifragilisticexpialidocious''.
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