Quote:
Originally Posted by theducks
Standard rules  always apply (just in case  ) : MAKE A BACKUP of your Library
Keep the last 2.x installer handy
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Quote:
Originally Posted by kovidgoyal
Obviously backup your data if you are concerned.
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Sound advise, and I always advise that
Quote:
Originally Posted by kovidgoyal
-- it is all magic -- assuming there are no bugs, of course.
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Sounds promising (especially the "magic"

part), and possible bugs are part of the game, not?
What made me think and posed the question in the first place was the possible home-brew constructs one can have made in the past, like private columns, functions and such. They sometimes can have impact on migration / transformation activities by causing unexpected behavior as this is hardly testable for everybody in advance.