How do I add a 2nd Backup drive to TM

How do I add a secound hard drive for backups in TM?
I have a HD backing up areas of several hard drives but I have run out of space on that terabyte BU drive.
I want to add a second drive to backup files that I don't have space on my current BU Drive for.
How do I add the second drive.
thanks

Time Machine will only backup to one destination.
The only option you have is to create a RAID set to combine the existing drive with the new drive. This has inherent risks, not least of which is that if you get it wrong you'll wipe the existing drive and your backups now depend on two drives, not one (meaning you've doubled the chance of losing your backups due to a failed drive - if either drive in the backup RAID fails it's all gone).
Note that IIRC you can't do this through the GUI, so you'd have to use the command line. This example assumes your existing TM drive is at /Volumes/ExistingTMDrive and you want to add /dev/disk2 to the array:
diskutil enableRAID concat /Volumes/ExistingTMDrive
diskutil addToRAID member disk2 /Volumes/ExistingTMDrive
The above is untested, but should work.

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