I plugged in an external drive into a new Mac and one of the options presented was a checkbox to Encrypt Backup Disk. 1. Is this so if someone takes my Time Machine Backup Drive they will not be able to access my data? 2. How Do I access my data if I enable this option? Does it ask me for a password overtime I try to access the drive? 3. Is there a way to enable the encryption option on a Time Machine drive that is already in use? Thanks.