Multiple alternate target drives

However, for security purposes, I wish to replace this drive with an identical one each week and then take the alternate drive offsite. It would again get replaced the following week with the first drive, keeping us with no more than 1 weeks lost data in case of a disaster.

 

How do I best accomplish this task? When the alternate drive is placed in the system using the same volume name and drive letter, Norton gets confused as to where the target drive has gone. I can set up a new backup job for the new drive, but I want to streamline this process for the user so all they have to do is replace the drive each Friday.

 

Any suggestions on how to accomplish this would be greatly appreciated.