Backup - tftp download or show run?

I am testing DeviceExpert, seems to be working great and straightforward. Only hitch so far is that when I view the config for my PIX 501, the VPN passwords are all ******.

ie.
isakmp key ******** address
isakmp key ******** address
isakmp key ******** address

Rather than:
isakmp key Password1 address
isakmp key Passw0rd2 address
isakmp key HiImapassword address
etc.

I assume this is because it is taking the output of 'show run' rather than writing tftp. This is not good because if the device crashes we don't have the VPN passwords backed up. Already paid for this mistake once.

Let me know ASAP so I can continue testing.

Thanks!