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Re: Encrypt existing Time Machine backups?

Subject Re: Encrypt existing Time Machine backups?
Newsgroups comp.sys.mac.apps, comp.sys.mac.hardware.storage, comp.sys.mac.system
References (8 earlier) <zZSdnYL6eciIdYfLnZ2dnUU7-XWdnZ2d@earthlink.com> <mvesrs$7l4$1@dont-email.me> <6Kmdne4aRMfDM4bLnZ2dnUU7-d-dnZ2d@giganews.com> <RcKdnd_Z4twJJobLnZ2dnUU7-VGdnZ2d@giganews.com> <mvh4a3$i0g$1@dont-email.me>
From Alan Browne <alan.browne@freelunchvideotron.ca>
Date 2015-10-12 17:38 -0400
Message-ID <mdadnRDob63QtYHLnZ2dnUU7-RmdnZ2d@giganews.com> (permalink)

Cross-posted to 3 groups.

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On 2015-10-12 16:15, John Somerset wrote:
> On 10/12/15 9:54 AM, Alan Browne wrote:
>> On 2015-10-12 08:58, Alan Browne wrote:
>>> On 2015-10-11 19:56, John Somerset wrote:
>
>>>> 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.
>>
>> Doh.  I really misread what you wrote when I replied with the stuff
>> below.
>>
>> But yes, the drive remains encrypted and the data from the FileVaulted
>> drive is decrypted in memory on your Mac as needed, file by file (or
>> probably block by block)
>>
> Am I correct that if I encrypted a folder, I couldn't get at any file
> without decrypting the whole folder?

As I understand it no.  When you access the folder using the password it 
decrypts what you're "reading" for display or use but doesn't write an 
unencrypted version of the folder or files to disk.

JR or others can correct or clarify.

> Correct or not, that was my concept of it.  That's why I assumed
> Filevault needed to decrypt a disk to get access to any of it.  It
> sounded time-consuming, with disaster always lurking.

Nope.  I've been using it for many years (previous version and current 
File Vault 2 version) w/o issue.  Naturally my system (Filevault2) disk 
is also backed up very regularly with Time Machine and other static 
backups as warranted for things I want in read-only completely offline 
backup (DVD's).

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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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