Code42 CrashPlan supports backing up encrypted files, folders, drives, and filesystems that run at a system or user level.
FileVault 2 is compatible with both of the CrashPlan app's installation options: installed for everyone (default), or installer per user.
There is an option in Truecrypt enabled by default called preserve timestamps of file containers. When enabled, Truecrypt retains the file timestamp from initial file creation. Essentially, it looks like the file has never changed and CrashPlan won't back up the changes. If you disable this option, the file timestamp changes when files are modified, which allows CrashPlan to back up the changes.
BitLocker drive encryption
Windows BitLocker Drive Encryption provides full drive encryption. Since BitLocker runs at a drive level, CrashPlan is able to back up drives protected by BitLocker when the drive is in an open or unlocked state (decrypted at the drive level).
However, when the drive is locked (encrypted), CrashPlan can't back up the files and may report the drive as missing. If the CrashPlan app reports the drive as missing when it is unlocked, you may need to run a file verification scan.
Because CrashPlan backs up your files when they are unencrypted, they can only be downloaded as unencrypted files. You can download these files on other devices or using the administration console without worrying that the files will download in an encrypted state.
Windows Encrypting File System (EFS)
Windows EFS runs as a user. Consequently, the CrashPlan app must be installed per user to back up files protected by Windows EFS.
If you're using another encryption product with CrashPlan and have questions or would like to share your knowledge or discuss, please visit our User Forums.