Once you have specified the backup scheme and tape options, you should determine the minimal number of tapes necessary to achieve full automation of tape rotation.
To simplify the tape planning lets discard the possibility that the calculated tapes might contain backups of other data. It is implied that the Use a separate tape set option is enabled.
To calculate the number of tapes you should take into account the following considerations:
There is no common formula to calculate a number of tapes required in all possible combinations of above listed considerations. But the general way to get a number of tapes for a case includes the following steps: