1. activate disk utility in utilities. 

2. choose your time machine   disk.

3. choose erase

4. set your options as desired keeping your format option the same.

5. wait for the disk to be erased.

6. say yes to a time machine back up for this disk.

Hth.


On Dec 16, 2013, at 12:43 PM, George Cham <george.c...@mac-access.net> wrote:

> I am having a issue with my time machine backup .
> I’m getting a message saying that the backup failed .
> What i would like to do is reformat the external drive and start again .
> I can’t find the option in system preferences to do this .
> 
> 
> George Cham
> george.c...@mac-access.net
> 
> 
> 
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