Time Machine for 2 backup drives

I want to back up to 2 externals. I understand this can be done now.
<Subject Edited by Host>

Yes you can use as many external drive as you like to make Time Machine backups to. But you can only do one at a time, then disconnect that drive and connect another and then select that other drive as the Time Machine backup drive. Then you can do another full or partial TM backup to that other drive. But the next time you connect the original TM backup drive you will again need to Select it AS the TM Backup drive. It will then pickup the original backups you have made to it and backup changed files to it. Then you can disconnect it, reconnect the second drive and again SELECT that drive as the TM Backup drive.
You can do that as many time as you like to as many external drives as you like, 2-4-10 whatever number of externals. But you will need to Re-Select that newly connected drive AS the TM backup drive. TM only keeps a record of the Last Drive used. Not s series of drives used.

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