By far, the most popular security tip that I have ever posted describes a way that you can do your regular system backups and create a tape that can be restored with a single command, IBM's LODRUN command. Since originally posting this tip and the offer of free CL programs to implement it, I have sent the code out to many contacts over the year.
You can see the original post here. But, don's stop there as there is a followup updated post here. Make sure you read BOTH posts.
As always, if you have specific questions about this topic, you can reach me at rich at kisco.com, All email messages will be answered.