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<blockquote data-quote="chemist" data-source="post: 1660371" data-attributes="member: 84235"><p>One other question:</p><p>I understand there's two ways to encrypt a new Time Machine backup:</p><p>1) Do the TM backup to an unencrypted drive, selecting the encryption option when you start the backup. This is very slow -- putting 450 GB of data on my USB 3.0 portable looks like it's going to take ~15 hours.</p><p>2) First format the drive as "Mac OS Extended (Journaled, Encrypted)." Then proceed as above. I've read that, since the drive is already encrypted, this takes no longer than a non-encrypted TM backup (from <a href="http://www.macissues.com/2014/11/07/how-to-encrypt-your-time-machine-backups/):" target="_blank">http://www.macissues.com/2014/11/07/how-to-encrypt-your-time-machine-backups/):</a></p><p></p><p>"An alternative method for encrypting a drive is to set it up from scratch. Use Disk Utility to erase the drive, and when you add it as a backup destination in the Time Machine system preferences, you will be given an option to encrypt the drive. This will wipe all data on the drive, and then prompt you for a password to use for encrypting it. Unlike encrypting a drive that already has data on it, this will start from zero data so the encryption will be complete almost immediately. Now any new data copied to it (ie, your first full backup) will be fully encrypted."</p><p></p><p>Is the above correct, and is there any downside to do doing it this way? [Note that this is not an option if you are making an encrypted bootable clone; in that case you need to format the drive as unencrypted, make the clone (and a recovery partition), and then encrypt it (took 14 hours); though I suppose you could make a clone of just the system folder, encrypt, and then do a full clone to the encrypted drive, which might be much quicker.]</p></blockquote><p></p>
[QUOTE="chemist, post: 1660371, member: 84235"] One other question: I understand there's two ways to encrypt a new Time Machine backup: 1) Do the TM backup to an unencrypted drive, selecting the encryption option when you start the backup. This is very slow -- putting 450 GB of data on my USB 3.0 portable looks like it's going to take ~15 hours. 2) First format the drive as "Mac OS Extended (Journaled, Encrypted)." Then proceed as above. I've read that, since the drive is already encrypted, this takes no longer than a non-encrypted TM backup (from [url]http://www.macissues.com/2014/11/07/how-to-encrypt-your-time-machine-backups/):[/url] "An alternative method for encrypting a drive is to set it up from scratch. Use Disk Utility to erase the drive, and when you add it as a backup destination in the Time Machine system preferences, you will be given an option to encrypt the drive. This will wipe all data on the drive, and then prompt you for a password to use for encrypting it. Unlike encrypting a drive that already has data on it, this will start from zero data so the encryption will be complete almost immediately. Now any new data copied to it (ie, your first full backup) will be fully encrypted." Is the above correct, and is there any downside to do doing it this way? [Note that this is not an option if you are making an encrypted bootable clone; in that case you need to format the drive as unencrypted, make the clone (and a recovery partition), and then encrypt it (took 14 hours); though I suppose you could make a clone of just the system folder, encrypt, and then do a full clone to the encrypted drive, which might be much quicker.] [/QUOTE]
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