No, I do not do mobile backups with Time Machine.

When I first wrote about this odd behavior, there was an appearance of pairs of 
"simultaneous" backups through the day, but when I looked more recently, only 
the latest hourly backup had a duplicate entry.  If this does not extend 
throughout the entire backup list, then I guess I won't worry about it, though 
I still find it curious.



´╗┐On 03/06/2018, 12:01 AM, "Michael" <> wrote:

    On 2018-03-05, at 12:43 PM, Dinse, Gregg (NIH/NIEHS) [C] 
<> wrote:
    > That's a good idea.  I just checked and, based on the names of the 
folders, there appears to be only one per hour.  So, this suggests that the 
listing within the Time Machine app is reporting two backups per hour when in 
fact only one is being performed (or at least only one is being kept in the 
usual location).
    Do you have mobile backups?
    > Gregg
    > On 03/05/2018, 12:55 PM, "Macs R We" <> wrote:
    >    Why not examine the folder hierarchy on your backup drive and inspect 
the individual folder names, which will tell you when each backup set was 
actually taken.  Then at least you will know which end of the process is 
    >> On Mar 5, 2018, at 9:26 AM, Dinse, Gregg (NIH/NIEHS) [C] 
<> wrote:
    >> Hi,
    >> I am running MacOSX 10.12.6 on a mid-2010 Mac Pro tower.  I just 
upgraded from Yosemite to Sierra, so that may be related.
    >> I installed a "new" hard drive and dedicated it to Time Machine.  It's 
only been running for about a day.  I opened the Time Machine app today and, as 
usual, there are the tick marks along the right side of the screen that show 
when the various backups were performed (when the mouse hovers over a given 
tick mark).  Ideally the backups are about an hour apart.  In my case, there 
are pairs of tick marks with the same time listed.  That is, the last two tick 
marks show exactly the same time, the next two tick marks also show the exact 
same time (though an hour earlier), and so on.  I don't know if two backups are 
being performed each hour, or if the listing is just messed up.  Has anyone 
seen this?  Does anyone know how to fix it?  Is there some preference file 
somewhere that is messed up?
    >> Thanks in advance for any help you can give me,
    >> Gregg
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