Thanks for confirming that you had the same problem, and that it was a disk 
failure in progress.  I think the first thing I'll try is to replace the TM 
drive and see if this all clears up.  Thanks,

Gregg

On 7 Mar 2012, at 2:49 PM, Nathan Sims wrote:

> Check your system and console logs. This happened to me, too, where TM would 
> run and run and run. It turned out to be a disk failure in progress (on the 
> TM drive). Unfortunately for me, it was too late to save any of the data on 
> the drive.
> 
> On Mar 7, 2012, at 11:06 AM, Dinse, Gregg (NIH/NIEHS) [E] wrote:
> 
>> Hi Matt,
>> 
>> I was worried about a hardware problem.  As you say, either the TM disk or 
>> the system disk could be failing.  Both are very new (3-TB Seagates).
>> 
>> I have not yet looked for information in the Console app, but unless it's 
>> very obvious, I probably won't recognize a problem even if it's there.
>> 
>> Thanks,
>> 
>> Gregg
>> 
>> On 7 Mar 2012, at 1:03 PM, Matt Penna wrote:
>> 
>>> Greg,
>>> 
>>> Is it possible you have a hardware problem? Perhaps the TM disk or the 
>>> source disk is failing, and the backup is taking so long because of 
>>> difficulties reading or writing files.
>>> 
>>> Is there any useful information in the Console app?
>>> 
>>> The only time I've seen TM consistently take this long is on PPC hardware 
>>> running 10.5.
>>> 
>>> -Matt
>>> 
>>> On Mar 7, 2012, at 12:46 PM, "Dinse, Gregg (NIH/NIEHS) [E]" 
>>> <[email protected]> wrote:
>>> 
>>>> Both machines use an internal hard drive for the TM backups.  Both TM 
>>>> backup drives still have a lot of empty space, though the TM drive at home 
>>>> is larger than the TM drive at work.
>>>> 
>>>> I certainly have a few files at home that are larger than those at work, 
>>>> such as videos, but I exclude the Movies, Music, and Pictures directories 
>>>> from my TM backups, so that should not be the problem.
>>>> 
>>>> Any other thoughts?
>>>> 
>>>> Gregg
>>>> 
>>>> On 7 Mar 2012, at 12:36 PM, objectwerks inc wrote:
>>>> 
>>>>> How big are your data sets (how full with how much data are your disks)?  
>>>>>  Is the one at home using a local TM disk or a TM disk on your network?  
>>>>> Is the data set composed of LOTS of little files?
>>>>> 
>>>>> On Mar 7, 2012, at 10:07 AM, Dinse, Gregg (NIH/NIEHS) [E] wrote:
>>>>> 
>>>>>> Hi,
>>>>>> 
>>>>>> On my Mac Pro at home, Time Machine runs for about 30 minutes of each 
>>>>>> hour, even when I have not created any new files.  I also have a Mac Pro 
>>>>>> at work and it does NOT exhibit this behavior.  Both are running the 
>>>>>> latest version of Snow Leopard (10.6.8).  Does anyone have an idea about 
>>>>>> why Time Machine is running so much on one of these?  I expect Time 
>>>>>> Machine to run for a short period (maybe a minute or two), even without 
>>>>>> many files changing, since I assume it still has to search for possible 
>>>>>> changes, but 25-30 minutes seems really excessive when nothing much has 
>>>>>> changed.  Any thoughts?
>>>>>> 
>>>>>> Thanks,
>>>>>> 
>>>>>> Gregg

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