You cannot do that, and shouldn't try. What you need is an external drive large enough to hold a bootable backup of your startup volume.
Clone Yosemite, Mavericks, Lion/Mountain Lion using Restore Option of Disk Utility
When you make changes on your Mac like editing a photo, marking a Favorite, or adding to an album, they’re kept up to date on your iPhone, your iPad, and iCloud.com. And vice versa — any changes made on your iOS or iPadOS devices are automatically reflected on your Mac.
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.
Exporting an image to a folder in the Finder, and then adding that folder in the Desktop & Screen Saver pane in System Preferences is one way to use your favorite photos as desktop wallpapers. However, Photos for Mac has a built-in option for quickly setting any image in your photo library as a desktop wallpaper. The following part separately describes how to open an image as a new document or an addition to current document: 1. To Open an image as a new document, please do one of the following. (1)Open in “New Image” dialog Step 1. Double click to open PixelStyle Photo Editor in Applications or Launchpad or on desktop.
1. Select Disk Utility from the main menu then press the Continue
button.
2. Select the destination volume from the left side list.
3. Click on the Restore tab in the DU main window.
4. Select the destination volume from the left side list and drag it
to the Destination entry field.
5. Select the source volume from the left side list and drag it to
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the Source entry field.
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6. Double-check you got it right, then click on the Restore button.
Destination means the external backup drive. Source means the internal startup volume.
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Jul 13, 2015 6:44 PM