Can someone, preferably from the app engine team, or who has experience 
with this answer the following question:

I began migrating an M/S datastore app to HRD. It was taking forever during 
the 'Copy' phase, so I assumed it was stuck, and I reverted it. It is now 
stuck reverting, and I've filed a ticket for that, but that's a separate 
issue. 

I missed this part of the documentation, which states: 

"If you want to re-migrate to that target application at a later date, you 
must delete the target application's Datastore data."

What happens if I don't delete the data? It so happens that much of my data 
copied over - tens of millions of rows, which would cost hundreds if not 
thousands of dollars to delete. I am reluctant to just create a new app and 
migrate to it because I already got the mail quota removed from the current 
target, and that took a while.

What happens if you migrate and don't delete the data? Does it overwrite 
it? The migration tool gives you the option to perform the migration when 
data exists, but it gives you a warning and does specify what will happen 
if you don't delete the data. The docs clearly say you 'must' delete the 
target data, so I'm wondering technically what the ramifications are.

If you can answer this question without speculating, I'd be grateful. A 
successful migration without any hiccups and 100% data fidelity is very 
important to me.

Thanks, John

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