What I did was use the migration tool all the way up to, but NOT including the 
alias step.

Then I switched my domain settings around so that users go to the new app.


On Nov 16, 2011, at 5:12 PM, Kyle Baley wrote:

> I tried the datastore migration tool today from one test environment to 
> another and it went through smoothly. But it doesn't appear it can be done 
> more than once. I was hoping to test it out a few times before doing it in 
> our production environment. But two things lead me to believe it's not 
> possible:
> 
> 1) It creates an alias from the old app ID to the new one and I don't see any 
> way of reversing this
> 2) When you go to the migration tool after it's done, it shows the results 
> from the previous migration but no way to restart it.
> 
> Assuming it can be done only once, I don't feel comfortable enough to use it. 
> If something goes wrong during the migration (like, for instance, we miss 
> something in testing that doesn't show up until after we migrate), we'd like 
> an easy way to go back to the old app and continue on with it until the issue 
> has been resolved.
> 
> What that in mind, has anyone tried the Copy Data to Another Application 
> feature in the Datastore Admin console? Does that do the same thing as the 
> migration tool (at least from a data perspective)?
> 
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