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Number   :  9100
Date     :  2004-11-01
Author   :  des4212001
Subject  :  Re: Unexpected results all of a sudden
Size(KB) :  2



--- In xxcopy@yahoogroups.com, "John Zeman"  wrote:
> 
> --- In xxcopy@yahoogroups.com, "Jim Bruce"  wrote:
> > 
> > Every day i use an xxcopy bat to backup FAT32 to an NTFS USB 
drive.
> > Suddenly today it backed up everything as if the destination 
didn't 
> > exist. I stopped it to check - everything on destination was 
there. 
> I 
> > checked individual files to see if a touch op had gone wrong -
> > everything ok.
> > Is it coincidence that my clock went back an hour (BST) earlier 
> > today? or even Halloween!!!
> > How on earth should this happen?
> > Is there a flaw in my syntax?
> > 
> > 
> > example of entry from bat ...
> > xxcopy H:\ Q:\Backup\H\ /clone /YY /oad:\dos\xxcopy\Q.log
> 
> 
> 
> I can verify this, and there's nothing wrong with your script Jim.
> 
> In my situation (and I suspect yours) what happened was Windows 
(XP 
> Pro SP2) changed the last modified time stamps of all the files on 
my 
> source C: drive by exactly one hour when I booted up today.
> 
> There are a few ways you can deal with this. One would be to 
resign 
> yourself to having to do a total recopy of all files from the 
source 
> to destination twice a year when the clocks are changed by one 
hour.
> 
> However instead of what I'm doing (at least for now) is I've 
changed 
> my:
> /FF
> Option to allow a 2 second fuzzy file time differential to:
> /FF3602S
> To use a 1 hour plus 2 second fuzzy file time.
> 
> I realize that's not the best fix as now any file altered within 
an 
> hour of when I do my backup will not be copied, but it's better 
than 
> doing the whole thing over twice a year.
> 
> John

Damn, I forgot about the DST change and missed my chance to try this!

But... what if you uncheck the "Automatically adjust clock for 
daylight saving time" (Time & Date Properties\Time Zone tab) and 
change the clock manually? Or would Windows still change all the 
time stamps anyway?

I suppose I could diddle the clock & calender and test it out... if 
I was adventuresome.

DES



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