Thanks Ronni and Carlo
The back up drive is cable to Firewire. Your suggestion Ronni is working OK now.
Cheers
John 

On 13/12/2010, at 8:39 PM, Ronda Brown wrote:

> Hi John,
> 
> If it’s a directly-connected USB or FireWire disk, eject and disconnect it.
> If it has it’s own power supply, either turn it off or unplug it.  
> Wait a few moments, then Restart your Mac, then reconnect.
> 
> Then try re-selecting your Time Machine drive in Time Machine Preferences 
> (select the "none" drive, then the correct one).
> 
> Sent from Ronni's iPad
> 
> On 13/12/2010, at 8:07 PM, cm <[email protected]> wrote:
> 
>> Hi John,
>> 
>> I have seen setups where the wireless signal to a Time Capsule is a bit weak 
>> and connection with the backup drive is lost. What exactly is your Time 
>> Machine setup. Do you have backups going directly to an external hard drive 
>> that you plug into your computer? If so perhaps the drive was not plugged in 
>> when the next backup was scheduled to take place.
>> 
>> Cheers,
>> Carlo
>> 
>> 
>> On 2010-12-13, at 17:11, John Daniels wrote:
>> 
>>> 
>>> Hi folks
>>> I had a message on my screen from Time Machine program telling me that I 
>>> have either changed the backup volume or someone is trying to redirect the 
>>> backup to another disc. I have stopped backups and unplugged the external 
>>> disc. 
>>> Has anyone come across this before?
>>> Cheers
>>> John
>>> 
>> 
>> 
>> 
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