Scheduling backup tasks alternating months

I'm using Acronis True Image Echo Server, version 8 for my Windows 2003 server. I was wondering if there was any way to schedule alternating months for the backup schedule. What I want to do is have one month's backup (for example, October) would go to one file name and the next month (for example, November), would go to another file name.

The reason for this is that I want to keep 2 months worth of data, just in case I need to go back to it 2 months ago, the data would still be there for my to retrieve. I checked all the scheduling options in the program but there doesn't seem to be a way unless I use the daily backup and set it to run every 60 days?

Any help would be appreciated, thanks!