[TUHS] Irwin 285

Larry McVoy lm at bitmover.com
Fri Jan 22 08:15:23 AEST 2010

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.
Larry McVoy                lm at bitmover.com           http://www.bitkeeper.com
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