Time Machine API / Command-line scripts?

Question

I need the reference, if it exists, to Time Machine's API or simply some commands that can change the disk in use with Time Machine and back!

I'd like the script I'm going to write to do the following:

Change from disk A to disk B
Force Time Machine backup
Change from disk B back to disk A

Thank you!

Answer 1

Lion added tmutil, a command line interface into Time Machine.

https://apple.stackexchange.com/questions/17759/what-tiny-thing-in-lion-makes-you-smile-or-has-caught-you-off-guard/18665#18665

Answer 2

If AppleScript is fine with you have a look at this post with script. It should serve as a basis for your own.

Answer 3

Apple time capsules include an 'archive' command that can back-up the time capsule disk to an external USB-attached disk.