How to schedule backups to run in alternate months

Hi, our customer's master server is NBU 5230 appliance, version 2.6.3 (equivalent to NBU 7.6.0.3). They want to schedule some policies to run in alternate months. For example, policy A run in odd months (1,3,5,7,9,11) and policy B run in even months (2,4,6,8,10,12). Both policies back up the set of clients. The reason to this is that the customer wants to use different volume pool for alternate months (one pool for odd months, one pool for even months).

Is this configuration possible? If yes, how to configure it? If no, can the cusomer's requirements be fuifilled by some other ways? Thanks.