scheduled backup destination with bitlocker

hi

I want to backup my Windows Server 2012 R2 host to a destination fixed disk but I want it to have Bitlocker drive encryption. I'm going to store the backup in my car!

When I set up a scheduled backup, and choose the disk, it's reformatted and hidden from explorer. No drive letter is assigned.

How do I bitlocker it?

Am I doing it the right way?

Thanks

Tim

Tim