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Yes, this does require a physical connection to the device, so network disks won't work. Just to be safe, have another good backup on another disk. It is taking a while too, so it might encrypt the whole file system, which will block recovery from anything older than Lion. When I enabled it, it did a long 'preparing for encryption' step (probably a check disk), a quick backup, and now its sitting there encrypting.

I'd speculate it uses the same method as FileVault2, but I don't know. Requirements for encryption are just Mac Extended (Journaled) file system on a GPT-partitioned disk.

You probably won't need it ever again unless you recover the backup from a different machine, so remembering it would be tricky. Give it a good password, and never lose it. Check the checkbox in this dialog to Encrypt backup disk. and select the disk you're currently using for backup. Now that leaves me to Mac OS (Case-sensitive) vs.Time Machine finally supports encryption here's how to activate it.Īt the Time Machine preference pane, go to Select Disk. Mac OS (Case-sensitive, Journaled)? Any advice? Now that leaves me to Mac OS (Case-sensitive) vs. It will also attempt to restore any unsaved documents that you were working on at the time of the power failure. If your Mac should go down, due to, for example, a power outage, when you restart your Mac, the Mac OS will check the journal and will perform a consistency check on the drive's directories and file structure. Journaling is a process whereby the Mac OS keeps an eye on what you are doing while you work, it keeps a journal, keeping track of changes you have made to your files. Journaling was developed primarily for Mac servers to protect the integrity of the disk Directories and file systems. If you will be using the drive as a media or 'scratch' drive, for video editing, then you would select Mac OS Extended, journaled not selected, as the journaling process slows down the write speed performance of the drive. If you are going to use the drive as a system or 'boot' drive, with the Mac OS on it, then you would want to select 'Mac OS Extended (Journaled)'. The format that we chose, 'to Journal or not to Journal' depends on what the drive will be used for. I came to learn that Mac OS Extended (Journaled) and Mac OS Extended. I just would like to know if there are other alternatives. I know that Mac OS (FAT) is compatible with both PC and Mac platforms, however, there's a limit to trasnferring files to 4GB. I guess my real question is the difference between all four of the following options: Mac OS Extended, Mac OS Extended (Journaled), Mac OS (Case-sensitive), and Mac OS (Case-sensitive, Journaled) when reformatting an external hard drive?