HT201250 back up takes a extremely long time

I got a new Western Digital My LIve Duo. I am using time machine to back up to the drive. It is exremely slow. For example, it has taken 6 hours to back up 35 GB (out of 2.5 TB). Time MMachine says it will take 17 days to complete at this rate. If I wait longer, only a few more GB will have backed up and TM will say something like 30 days to backup.
I have backed up another Mac with the same backup drive and it did not behave this way.
Any ideas?

Here are some troubleshooting articles:
http://pondini.org/TM/Troubleshooting.html
http://support.apple.com/kb/PH11194
http://support.apple.com/kb/HT3275 (note - older article)
Although it doesn't explain the difference between the two computers, try doing an incremental backup to see what happens. Based on my experience with Time Machine in the past, either the program or the computer seem to get unhappy when copying large amounts of data.
Go to System Preferences/Time Machine and click on the options button. Exclude items until you get a reasonable size backup (10-20 GB seems to work). Backup and then using the - in the options window make more available for backup. Repeat until everything is backed up. It takes more time and effort this way, but it gets the job done. This is how I normally do a first time backup.

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Message was edited by: R C-R

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