Time Machine issue with multiple drives...

So I am trying to run two backups, one wirelessly and the other through a wired USB connection. This is for a MacBook Air, so it's not always connected to the USB drive. The instructions I found online said that once you click "Select Disk" and to to add another disk, it will ask you if you want to switch disks or use both. That option for "both" never came up, and it was like I was selecting a new Time Machine disk. Why is that? Can't I use both disks as automatic back-ups? I am thinking of adding a third, and didn't want to continue unless I was sure. I have OS 10.7.5

The option to use multiple backup disks is only in OS X 10.8 and later.

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    Message was edited by: Kappy

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