I have written a script that is to be used in self service. It allows person with only User level rights to turn on an encrypted time machine backup. The script has the user select a drive that is connected to their system. The script checks if the drive partitioned with GUID and that it is formatted with JHFS+. It will warn the user 3 times before formatting the drive if needed. It will ask the user for a password for the drive, it will ask them to verify the password. If the passwords match it will continue, if they do not they will be asked to re-enter them.
https://github.com/darklordbrock/scripts/blob/master/UW-Milwaukee/timeMachineSetup.sh
