[TUHS] Irwin 285

[M. Warner Losh]

In message: <20100121221523.GL9956 at bitmover.com>
            Larry McVoy <lm at bitmover.com> writes:
: On Thu, Jan 21, 2010 at 04:36:21PM -0500, lyricalnanoha wrote:
: > On Thu, 21 Jan 2010, Larry McVoy wrote:
: >
: >>>> If you aren't backing up with a crc then you are doing it wrong.
: >>>
: >>> True, but CRC does not buy you much if the media are fubared enough to be
: >>> largely unreadable.
: >>
: >> We compare the CRC against previous backups.  A table of
: >>
: >> pathname, size, mtime, CRC
: >>
: >> you compare all the ones that are the same and flag the ones that differ
: >> only in CRC.
: >
: > Sounds a lot like SFV files.
: 
: Yeah, except that it works when the files don't have the CRC's, i.e.,
: it works for all files unchanged since the last backup.

It is basically what rsync does over the network...

Warner
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