Why is time machine lagging and taking over 8 hours to backup?

Hi,
I have a 15" Macbook Pro (Mid 2012) running 10.8.5.
I started a time machine back up last night before going to bed - the dialogue box said it estimated 3 hours to complete...
8 HOURS later and it's still backing up. It's showing "about 5 seconds" and has been for about 15 minutes. There's still about 20 GB left and it's hardly chipping away at it.
Can anyone tell me why this might be happening? This machine is relatively new and it's my first time backing up to time machine on this particular machine but never had any problem with my previous Macbook Pro.
Any help would be great. Here's a screenshot if it helps...
Thanks!

Thanks for your reply AIRoRo.
Is there meant to be an actual setting specifically for time machine in Energy Saver? That's how I understood your reply.
Or I misunderstoo that then, I presume I should untick "put hard disks to sleep when possible"? each time I back up?
Although I never had to tick / untick this box each time I backed up in the past.
Here's a screenshot of my settings:

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  • I'm running OS X 10.6.8-Why is Time Machine all of a sudden backing up 225GB of data after 2 years of perfect service? I have not added, deleted, or upgraded anything, Help!

    I'm running OS X 10.6.8-Why is Time Machine all of a sudden backing up 250GB of data after 2 years of perfect service? I have not added, deleted, or upgraded anything.

    USB 3.0 drives work on USB 2.0 but you do get 2.0 speed. They are cheaper because they are popular PC drives.  If you get a new computer you'll get the bump to 3.0 speed.
    I like the Seagate USB 3.0 Backup plus drives. They come formatted for PC but easy to format in Disk Utility.  Seagate Backup Plus Right now the 1T is more than the 2 & 3T drives
    This Western Digital drive has good reviews: WD My Book Hard Drive for Mac 2 TB $99.
    Locally, Best Buy seems to have the best prices.
    USB 3.0 is 10x faster than USB 2.0
    Thunderbolt is 12 times faster than FireWire 800 and up to 20 times faster than USB 2.0.
    Format new drives with Apple's Disk Utility rather than the software that come with the drive.
    My plan was to rid a lot of the stuff I have on my computer (to a hard drive) anyhow once it had backed up.
    I wound't necessarily backup those files to Time Machine. I would copy to the external drive then delete from computer. Only backup to Time Machine the data you would want to restore to your Mac if there was a problem. The backup will go much faster this way. Time Machine backup is slower than just copying data in my experience.

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