Report Bitlocker and Retrospect 17 in Professional Posted April 27, 2020 All individual files on the disk are stored encrypted. - after Windows has booted up to its login screen thief still has to login. Without login he cannot access anything. - If the thief puts the disk in another computer he needs the BitLocker key to read or change files on the disk. - If the thief boots the computer from USB stick he needs the Bitlocker key to read or change files on the disk. Retrospect can backup the computer through Retrospect client without a human user actively being logged in. That’s because Retrospect Client is running in the background under a standard Windows account (Local System) and that account can read files. So of course you should have set a password on the Retrospect Client to prevent someone accessing the unencrypted files through the Retrospect API.