Re: Unique files

[Colin Percival <cperciva@tarsnap.com>]

On 10/26/14 06:52, jerry wrote:
> On 10/25/2014 12:21, Scott Robison wrote:
>> Is there a means to determine what is "new" between two "full"
>> archives? I do a full archive of an entire partition each day, and am
>> a little surprised by how much new data exists. I would like to "diff"
> 
> *** Do you have the "noatime" option on your filesystem?  Without that, the
> filesystem will track, for each file, not only when it is modified, but
> when it is *read*.  So every read anywhere produces a write.  This is
> for Linux, I don't know if it holds for other OS's.

Tarsnap defaults to not storing file access times, so this shouldn't be
the issue (unless Scott is using the --store-atime option).

Colin Percival