Time Machine "prepares" slowly and then does NOT complete B-U.

Since Christmas day, I've had a Time Machine problem. First it takes about 40 minutes to "prepare" to back-up and then it only backs-up 15gb out of 105gb.
And the animated icon keeps rotating for hours without completing the task. Could someone please share their knowledge on how I might be able to fix this issue? It would be greatly appreciated.

If you have more than one user account, these instructions must be carried out as an administrator.
Launch the Console application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Console in the icon grid.
Make sure the title of the Console window is All Messages. If it isn't, select All Messages from the SYSTEM LOG QUERIES menu on the left. If you don't see that menu, select
View ▹ Show Log List
from the menu bar.
Enter the word "Starting" (without the quotes) in the String Matching text field. You should now see log messages with the words "Starting * backup," where * represents any of the words "automatic," "manual," or "standard." Note the timestamp of the last such message that corresponds to an abnormal backup. Now
CLEAR THE WORD "Starting" FROM THE TEXT FIELD
so that all messages are showning, and scroll back in the log to the time you noted. Select the messages timestamped from then until the end of the backup, or the end of the log if that's not clear. Copy them to the Clipboard by pressing the key combination command-C. Paste (command-V) into a reply to this message.
If all you see are messages that contain the word "Starting," you didn't clear the text field.
If there are runs of repeated messages, post only one example of each. Don't post many repetitions of the same message.
When posting a log extract, be selective. Don't post more than is requested.
Please do not indiscriminately dump thousands of lines from the log into this discussion.
Some personal information, such as the names of your files, may be included — anonymize before posting.

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On my Mac Pro, early 2008 2 x 2.8GHz Quad Core 10.7.5, replaced 4 x 500ghds with 4 x 3Tb. The Raid card Raid 5ed them OK but can not load time machine back up as it does not see any of the 4 drives, neither does disc utilities, any thoughts?

You don't see drives when using a hardware RAID only the volumes.
WD Green are not suitable for hardware RAID (or software RAID for that matter).
USB2 and TimeMachine are a disaster waiting to happen. I've used SATA (internal) and eSATA (using SATA PCIe cards) trouble-free.
I can't say I begin to understand your use or "choosing the install drive for the backup"
Install what?
You don't load TimeMachine. Maybe seems minor but that is not how to describe the behavior of software.
You read FAQ and How To http://www.apple.com/support/timemachine
Time Machine’s Gory Details:
https://www.apple.com/support/timemachine/
TimeMachine 101
https://support.apple.com/kb/HT1427
Lion Recovry & TimeMachine
http://www.apple.com/support/lion/installrecovery/
http://www.apple.com/support/lion/
How To Restore Your System
http://pondini.org/TM/14.htmlMac OS X v10.7 Lion
Pondini's Blog: Time Machine - Troubleshooting -- B5. Would you like to inherit (or re-use) the backup . . . ?

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HT3275 Time machine at home and it will not allow me to remove the listing of my external hard drive from the excluded files list.

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HT3275 Since updating OS to Mountain Lion from leopard, I get the following error message when trying to backup with time machine on external drive. Could not complete backup to media share. The network backup disk does not support the required AFP feat

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Mac 101: File Sharing
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Look in the Utility folder which is located inside the Applications folder.
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Hello jr:
Welcome to Apple discussions.
I have never seen that before. However, I think I would trash the preference file (com.apple.timemachine.plist) and restart your computer.
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Message was edited by: Awumba

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Time Machine "prepares" slowly and then does NOT complete B-U.

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