Hi, I have a MacBook Pro Retina 13" 256GB with a 2TB attached external drive 
(currently with around 550GB on the external drive). I have the external drive 
INCLUDED in my TC backups and the backup size (according to the TM Options 
panel) is 659GB. It has been backed up for many months now and routinely has 
been doing the updates hourly per the normal schedule. The backup drive is 1TB 
attached via the USB with a powered hub to the 3TB TC.

I know some might think having only 1TB is small for a machine capable of being 
around 2.25TB (on board Mac Pro drive + the 2TB external) but for the moment 
the held memory is well inside the 1TB limit.

Last night i took a video with my iPhone and then imported it to the MacBook 
Pro to iPhoto. The video file was ~330MB only 2 minutes worth.

Last night I also tried to push the video file up to my Dropbox and it said 
around 1 hour to complete which was fine so I just let it go. This morning when 
I woke up the Macbook, it still hadn't completed and it said it had 10 minutes 
remaining. Then I noticed it commencing a routine backup and I often check the 
size of the backups just to keep a mental track of data backup size. The Backup 
is 174.92GB (yes GB)!!

I was very surprised to see this as normal backups are in the order of ~50MB or 
maybe 1 or 2GB if I have imported some photos but I have never had a routine 
backup this size. 

Is there a way that I can interrogate what files are being backed up so I can 
see what has caused this? It will significantly reduce the freeboard I had to 
the 1TB for what appears to be for a meaningless reason. Maybe it was the 
Dropbox activity that's caused this.

Regards


Pete
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