Thanks for the reply
The first KB relates to W2K and XP (OS is Server 2008 R2) - and exporting to a pfx was not a problem.
The second KB refers to firefox - typical I guess that whilst you can navigate to the cert store within IE9 there are no backup functions, that I can see.. I see no reason that the daily server backup won't include the cert (which leads to other problems security-wise)
As it turns out this KB
does go into backing up the cert - but it is the process for exporting the pfx. I guess it can be imported back into the certificate store from the pfx file. As it happens I exported two variants, one that included all certificates in the path and one that didn't (an issue with VS2010)...
More than anything I am trying to find a 'best practices' document to prevent the certificate becoming compromised...
Have a great weekend