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Re: Encrypt existing Time Machine backups?

Cross-posted to 3 groups.

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On 2015-10-11 19:56, John Somerset wrote:
> On 10/11/15 6:52 PM, Ant wrote:
>> In comp.sys.mac.apps Neill Massello <nmassello@yahoo.com> wrote:
>>> Ant <ANTant@zimage.com> wrote:
>>
>>>> Oh. I'll try that then.
>>
>>> Just be aware that doing so will convert the Time Machine disk into a
>>> CoreStorage volume that can't be repartitioned with the Disk Utility
>>> app. You'll have to use the diskutil command in Terminal.
>>
>> Also, is this true from
>> https://discussions.apple.com/message/29093757#29093757's post about
>> encrypted TMs making things harder to be portable, recover, etc.?:
>>
>> "Potentially.  Hard disks are glacial, which means the encryption isn't
>> that much of an added burden.   The usual trade-offs are the loss of
>> keys, difficulties with portability across operating systems, and the
>> need for a long and random key for reasonable security."
>>
> Oh, I thought that encrypting a disk, as with Filevault, meant the whole
> disk had to be unencrypted to work. If memory can grab only what it
> needs, that sounds much faster.

When FileVault is started it encrypts every known file on the disk, it 
does not encrypt unused disk space.  This happens quietly in the background.

If you're encrypting a re-purposed disk that had deleted files that you 
want to be sure cannot be recovered, then you should 'erase' the disk in 
disk utility first.  The lowest level of security is adequate.

If you're encrypting a disk with data on it that you don't want to use, 
and it has deleted files on it, then you could random fill the empty 
space to be sure old deleted files are actually written over (empty the 
trash first).

> I found the encryption option in the preferences of TM in El Capitan. It
> was greyed, so I guess I'd have to do what JR said.

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Thread

Encrypt existing Time Machine backups? ANTant@zimage.com (Ant) - 2015-10-11 12:37 -0500
  Re: Encrypt existing Time Machine backups? Jolly Roger <jollyroger@pobox.com> - 2015-10-11 17:45 +0000
    Re: Encrypt existing Time Machine backups? Alan Browne <alan.browne@freelunchvideotron.ca> - 2015-10-11 13:57 -0400
      Re: Encrypt existing Time Machine backups? ANTant@zimage.com (Ant) - 2015-10-11 13:05 -0500
      Re: Encrypt existing Time Machine backups? Jolly Roger <jollyroger@pobox.com> - 2015-10-11 18:07 +0000
        Re: Encrypt existing Time Machine backups? ANTant@zimage.com (Ant) - 2015-10-11 13:11 -0500
          Re: Encrypt existing Time Machine backups? Jolly Roger <jollyroger@pobox.com> - 2015-10-11 18:17 +0000
            Re: Encrypt existing Time Machine backups? ANTant@zimage.com (Ant) - 2015-10-11 14:07 -0500
              Re: Encrypt existing Time Machine backups? nmassello@yahoo.com (Neill Massello) - 2015-10-11 15:16 -0600
                Re: Encrypt existing Time Machine backups? Alan Browne <alan.browne@freelunchvideotron.ca> - 2015-10-11 17:37 -0400
                Re: Encrypt existing Time Machine backups? ANTant@zimage.com (Ant) - 2015-10-11 17:48 -0500
                Re: Encrypt existing Time Machine backups? nospam <nospam@nospam.invalid> - 2015-10-11 18:53 -0400
                Re: Encrypt existing Time Machine backups? ANTant@zimage.com (Ant) - 2015-10-11 17:58 -0500
                Re: Encrypt existing Time Machine backups? nmassello@yahoo.com (Neill Massello) - 2015-10-12 00:38 -0600
                Re: Encrypt existing Time Machine backups? nospam <nospam@nospam.invalid> - 2015-10-12 12:01 -0400
                Re: Encrypt existing Time Machine backups? nmassello@yahoo.com (Neill Massello) - 2015-10-12 00:38 -0600
                Re: Encrypt existing Time Machine backups? nospam <nospam@nospam.invalid> - 2015-10-12 12:01 -0400
                Re: Encrypt existing Time Machine backups? ANTant@zimage.com (Ant) - 2015-10-11 17:52 -0500
                Re: Encrypt existing Time Machine backups? John Somerset <somerset@nospam.com> - 2015-10-11 19:56 -0400
                Re: Encrypt existing Time Machine backups? Alan Browne <alan.browne@freelunchvideotron.ca> - 2015-10-12 08:58 -0400
                Re: Encrypt existing Time Machine backups? Alan Browne <alan.browne@freelunchvideotron.ca> - 2015-10-12 09:54 -0400
                Re: Encrypt existing Time Machine backups? John Somerset <somerset@nospam.com> - 2015-10-12 16:15 -0400
                Re: Encrypt existing Time Machine backups? Jolly Roger <jollyroger@pobox.com> - 2015-10-12 21:32 +0000
                Re: Encrypt existing Time Machine backups? Alan Browne <alan.browne@freelunchvideotron.ca> - 2015-10-12 17:39 -0400
                Re: Encrypt existing Time Machine backups? Alan Browne <alan.browne@freelunchvideotron.ca> - 2015-10-12 17:38 -0400
                Re: Encrypt existing Time Machine backups? Jolly Roger <jollyroger@pobox.com> - 2015-10-12 22:27 +0000
                Re: Encrypt existing Time Machine backups? Jolly Roger <jollyroger@pobox.com> - 2015-10-12 02:31 +0000
                Re: Encrypt existing Time Machine backups? ANTant@zimage.com (Ant) - 2015-10-13 01:58 -0500
                Re: Encrypt existing Time Machine backups? Jolly Roger <jollyroger@pobox.com> - 2015-10-13 07:09 +0000
                Re: Encrypt existing Time Machine backups? Lewis <g.kreme@gmail.com.dontsendmecopies> - 2015-10-12 03:04 +0000

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