HT203177 Time machine calculates for hours. Never goes any further. Help!!!

When I turn Time Machine on it calculates for hours and never goes any further.  Then when I turn it off, it goes to "Stopping backup... and does that for hours.  Is ther anyway to reset it or start over.  The external drive I am using (directly connected to the iMacvia USB) tests OK and Time Machine was backing up to it just fine until mid January.  How do I solve this dilemma.  Is there any way to solve this problem, or do I just give up on Time Machine and get some third party software that will work?  Thanks.  JAK

Have you looked through Pondini's extensive TM help site?
http://Pondini.org/TM/FAQ.html
Get carbon copy cloner...
http://www.bombich.com/software/ccc.html
Or SuperDuper...
http://www.shirt-pocket.com/SuperDuper/
Or the most expensive one & my favorite, Tri-Backup...
http://www.tri-edre.com/english/products/tribackup.html

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