Clean Install, how not transfer any junk/corrupted files?

Discussion in 'OS X Yosemite (10.10)' started by imorton, Apr 5, 2015.

  1. imorton macrumors 6502

    Aug 21, 2010
    Hi Guys, I am looking for your educated opinions in regards to doing a CLEAN INSTALL of Yosemite.

    I have an early 2011 13" MB Pro, with 8Gb and two (2) 256Gb SSD's installed INTERNALLY. I am running Maverick, and I also use the 2nd SSD (split in 2 partitions) to do a Time Machine backup & am doing a CCC backup (Carbon Copy Clone).

    I downloaded the Yosemite installer and created a USB Installer key, and want to do a clean install, but don't want to transfer ANY JUNK/CORRUPTED FILES from Maverick.. I have been getting the odd kernel panic (once every 2 weeks), and have been upgrading the OS since @ 2007.

    Should I use the CCC backup to transfer programs, data, etc... OR should I use Time Machine and use Migration/Setup Assistant...?

    Any ideas would be deeply appreciated?

  2. simonsi macrumors 601


    Jan 3, 2014
    Honestly? Just upgrade rather than clean install.

    If you can identify junk/corrupted files then remove or fix them now, if you can't then the process of installing Yosemite is not likely to id them for you.
  3. Taz Mangus, Apr 5, 2015
    Last edited: Apr 6, 2015

    Taz Mangus macrumors 68040

    Taz Mangus

    Mar 10, 2011
    If you plan on doing a clean install make sure to do a Time Machine backup first. I also suggest that you don't copy over any OS X system files from /Library and /System. Copy over only necessary user data from:
    • ~/Desktop
    • ~/Downloads
    • ~/Documents
    • ~/Pictures
    • ~/Movies
    • ~/Library/Safari
    • ~/Library/Application Support and ~/Library/Preferences plist files. You can tell which to copy over usually by the application that is installed.
    You can always go back to the Time Machine and copy over anything that you think you have missed later on.

    Interestingly, before I installed Yosemite I was also having lots of issues with Mavericks doing spontaneous reboots. I also figured it was time for a clean install using Yosemite as I wanted to upgrade from Mavericks as well. Now everything runs great for me using Yosemite.
  4. imorton thread starter macrumors 6502

    Aug 21, 2010
    I know I could just do an upgrade, but was hoping that a "clean install" would give me a fresh start, especially considering that I have been upgrading since 2007.

    I just figured that there's some apps like Parallels, Mac for Office, and others like that I my have a hard time finding Serial Keys etc....

    Than there's Mail, hoping that I get back all my email history, iCloud keychain, and plenty of other features that I know I'll forget.

    After reading the forums, I am now feeling 50/50 on upgrading to Yosemite, as many complaints of UI and Wifi problems etc....

    That old saying, "if it ain't broke, don't fix it"
  5. simonsi macrumors 601


    Jan 3, 2014
    Well normally a clean install would cause that problem, an upgrade means you shouldn't need to re-enter software licenses.
  6. imorton thread starter macrumors 6502

    Aug 21, 2010
    Maybe what I should do is use an EXTERNAL USB hard drive to do a complete CCC backup, and put that backup aside for me to use/keep for longer term backup/file restore access ( 1 week to a month) should I need something go awry (or if I realize further down the road that I needed a hidden/deep files for some application/history/setting etc...)
  7. Taz Mangus macrumors 68040

    Taz Mangus

    Mar 10, 2011
    Yes, that would be a good idea.


    Here is the advice I give people unsure about using Yosemite, create a new partition on your internal hard drive, install Yosemite on the new partition and boot to the new partition. Use it for awhile and see if it works for you. When you are done boot back to your primary partition and delete the other partition with Yosemite on it. This way you have not affected your current install and you get to test drive Yosemite. Just a thought.
  8. Utterchaos23 macrumors member


    Mar 20, 2011
    Brighton UK
    To go back to the OP.....

    I'm in need of a clean install of 10.10.3 so a quick look back at the original post...

    Better to migrate my user account from Time Machine or Clone?

    Both are USB3.

    Will Clone come with errors?

    Will TM be slower (compressed?)

    Cheers all
  9. grahamperrin macrumors 601


    Jun 8, 2007
    Time Machine and compression

    If an original file is not compressed, then Time Machine will not compress that file for backup purposes.

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