Time Machine does not complete backup to Time Capsule

Within the past few days my iMac will not complete a backup to my Time Capsule.   The two other computers connected to the Time Capsule appear to be backing up but they size of the backup is smaller.   The Time Machine starts but then stops after 10 or so minutes.   Also, the size of the to backup is ver large, and I have not added that much to my files since the last complete backup.
Here is what I tried:
1. Deleting the com/apple/Timecapsule.plist file and restarting the Time Capsule.
2. turning off WIFI and connecting to an ethernet cable
3. Verifying the disk (when connected to with the ethernet cable)
Nothing worked although Deleting the com/apple/Timecapsule.plist file and restarting the Time Capsule it got about 50% through before crapping out.
Appreciate any ideas.
Thanks

What OS is the computer running? Expect issues with Yosemite.. it is just not that reliable.
How much space does it require and how much is available on the TC?
What speed is the backup doing? If it is super slow it can trip out.
You did the right things, using ethernet and verifying the old backup.. But if you upgraded to Yosemite (upgraded??) then I strongly recommend you start a completely new backup.
Did you load the widget so you can actually check the log info.. to find out why TM stopped??
A1 here. http://pondini.org/TM/Troubleshooting.html
It is hard to fix issues when you don't even know what the issue is.

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