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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