Encrypting Time Machine backup?

Discussion in 'iMac' started by PhillyAnt, Feb 1, 2013.

  1. macrumors regular

    PhillyAnt

    Joined:
    Jan 5, 2013
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    Philly
    #1
    Do you encrypt your time machine backup? I have never done so with my older iMacs but I chose to do it with this new setup. When I hooked up my new external HD for the first time it asked me if I want to encrypt and I chose to. What are the pros/cons to doing this? I know it will protect my data. Does it slow my Time Machine backup down or does it not affect it at all? I am working with a fully loaded 27" iMac ( i7, 3TB Fusion, 32gb Ram, 2gb Video) and am doing the Time Machine backup via USB 3. I am about 20 minutes into it and have backed up about 23 gigs so far. I will stop and start over though if you all think it will slow things down.

    Thanks for your time!
     
  2. thread starter macrumors regular

    PhillyAnt

    Joined:
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    Philly
    #2
    FYI: Its been about 60 minutes since I started the Time Machine backup and my progress is 265 GB of 595 GB saved so far with an estimate of "about an hour" left. That is saving the info via USB 3.0 with encryption.
     
  3. thread starter macrumors regular

    PhillyAnt

    Joined:
    Jan 5, 2013
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    Philly
    #3
    UPDATE: So it finished saving everything to the external a while ago but its been sitting at this for a while now. I don't know if it is actually supposed to move from this spot or if there is some kind of bug happening. Its just stuck at 6%.


    [​IMG]
     
  4. thread starter macrumors regular

    PhillyAnt

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    Philly
    #4
    UPDATE: about 6.5 hours later and its still only at 47%. Does anyone have any knowledge on this. Is this the normal amount of time it takes to encrypt? Is it encrypting the entire 3TB drive or just the info I put on it? I am just trying to figure out if I should be concerned or not. I am tempted to just reformat and do a regular TM backup. Everything is saved on the external but its just going through this encryption phase now.



    [​IMG]
     
  5. macrumors P6

    Weaselboy

    Joined:
    Jan 23, 2005
    #5
    That is normal. The first time takes a long time as it encrypts the entire drive.
     
  6. thread starter macrumors regular

    PhillyAnt

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    Jan 5, 2013
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    Philly
    #6
    Thank you. Finally a response from someone! lol

    Why does it take so long to encrypt? What is the process that it goes through that makes it so slow? Its encrypting the data I put on there and also the empty space?
     
  7. macrumors P6

    Weaselboy

    Joined:
    Jan 23, 2005
    #7
    It has to convert the entire volume to a core storage encrypted volume and that just takes a bunch of CPU cycles and time. There is a long article here that explains more about how it works.

    The good news is, after this initial encryption it is pretty transparent. I don't notice any speed difference with an encrypted Time Machine backup after that first run.
     
  8. thread starter macrumors regular

    PhillyAnt

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    Philly
    #8
    Thanks for the info
     
  9. macrumors newbie

    Joined:
    Apr 6, 2013
    #9
    It's much quicker if you select the encryption option when formatting the drive originally rather formatting without encryption and than selecting it when you set Time Machine backup.
     
  10. macrumors 68040

    Joined:
    Aug 9, 2009
    Location:
    Portland, OR
    #10
    I encrypt my TM/TC backup. I also use FV2 on all of our Macs. I do not want unencrypted data around. My cloud backup (Crashplan+) is encrypted with the highest option 448b.

    I do keep CCC clones of just my media and that is unencrypted. I restrict it to just media because it is unencrypted. You cannot perform identity theft with my media.

    /Jim
     

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