An important part of a good save procedure is to have more than one set of save media. When you perform a recovery, you may need to go back to an old set of your media if one of the following is true:
Save 1 Set A Save 2 Set B Save 3 Set C Save 4 Set A Save 5 Set B Save 6 Set C
And so on.
Many installations find that the best approach is to have a different set of media for each day of the week. This makes it easy for the operator to know which media to mount.