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Re: Encrypt existing Time Machine backups?

Path csiph.com!fu-berlin.de!uni-berlin.de!individual.net!not-for-mail
From Jolly Roger <jollyroger@pobox.com>
Newsgroups comp.sys.mac.apps, comp.sys.mac.hardware.storage, comp.sys.mac.system
Subject Re: Encrypt existing Time Machine backups?
Date 12 Oct 2015 22:27:59 GMT
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Cross-posted to 3 groups.

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On 2015-10-12, Alan Browne <alan.browne@freelunchvideotron.ca> wrote:
> 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.

If we are talking about encrypted disk images, then I believe the
decryption happens in memory as needed to access the file system on the
mounted virtual volume.

>> 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).

FileVault 1, the previous version which placed the user's home folder
contents into an encrypted disk image, was much more problematic and way
less secure.

-- 
E-mail sent to this address may be devoured by my ravenous SPAM filter.
I often ignore posts from Google. Use a real news client instead.

JR

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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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