Originally Posted by Garkin
Never.
When addon author wants to reset your saved variables for any reason, he will just change version in the addon code.
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If data for previous revisions of the game is no longer valid, it is a matter of increasing one number and the default is used instead of the stored data.
I went a step further and worked making my data resist changes of the game. I think I archieved that goal.
There is a minor case for removing the data of no longer needed/existing characters. But those won't be any relevant data sizes.