Erase and install - Can I select what I want to put back on from Time Machine.

I've been suffering from the super slow Yosemite problem. I have had two long sessions with the very nice people on Apple support and have we have made some progress - thank you Marie and Cheryl. They have suggested an 'erase and install' to resolve the problem.
I regularly back up my laptop to 'Time Machine' but I don't want to just reload everything as that may just bring the problem back again. So, the question is can I select which files and applications I want to recover from Time Machine?

Here's what you should do:
Install or Reinstall Lion/Mountain Lion from Scratch
Be sure you backup your files to an external drive or second internal drive because the following procedure will remove everything from the hard drive.
Boot to the Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
Erase the hard drive:
  1. Select Disk Utility from the main menu and click on the Continue button.
  2. After DU loads select your startup volume (usually Macintosh HD) from the
      left side list. Click on the Erase tab in the DU main window.
  3. Set the format type to Mac OS Extended (Journaled.) Optionally, click on
        the Security button and set the Zero Data option to one-pass. Click on
      the Erase button and wait until the process has completed.
  4. Quit DU and return to the main menu.
Reinstall Lion: Select Reinstall Lion/Mountain Lion and click on the Install button.
Note: You will need an active Internet connection. I suggest using Ethernet if possible
            because it is three times faster than wireless.
Once you know it's running properly you can begin re-installing your third-party software from the original media. Finally, restore your data from your Time Machine backup. This assures that all but your data files are freshly installed.

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    CS7981 wrote:
    However, like so many other users I'm online in a variety of places so most of the time (about 99%) my laptop isn't able to be connected to the external designated for HD backups and I've heard and read that the application Time Machine can use "snapshots" to create temporary backups to hold until you've connected your external the next time.
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    CS7981 wrote:
    How do I go about setting up this snapshot option so that my laptop can be regularly backing up my files without me having to be tethered to the external at the same time?
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    CS7981 wrote:
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    CS7981 wrote:
    And last but certainly not least, how can the user take use of this option but also prevent the TM snapshots from hogging every availabe byte of memory.
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