Migrate to El Capitan in a dual boot Situation

I have a Mac Book Pro 2011 with two internal hard drives.  (I got the optical drive, replaced by the second hard drive).  A reader has installed El Capitan.  The other disc has Snow Leopard.  I want to finish my transition to El Capitan while being able from time to time dual boot from the Snow Leopard disc in order to run some legacy applications.  Meanwhile, I have done work on "both sides of the fence" and do not want to replace or destroy data and applications that currently exist on the drive from El Capitan.

Can I use the Migration Wizard to move most of the data and compatible applications since the Snow Leopard disc to the drive of El Capitan?  Or who will overwrite what already exists on the disk of El Capitan?  Or can / should I I manually copy data and applications from one disk to the other?  My end goal is Snow Leopard "skeleton" for legacy applications, thanks to the drive of El Capitan being my main boot drive.

Hope this makes some sense.

When I had this situation, I did a manual copy, so I would have more control over what was copied and where he went.

Tags: Mac OS & System Software

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