[TUHS] Irwin 285
M. Warner Losh
imp at bsdimp.com
Fri Jan 22 08:22:31 AEST 2010
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...
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