Is the data stable?

Hi there,

I couldn't see an answer to this question in the FAQ or elsewhere so I thought I would ask.

I'm currently a Google App Engine customer and huge fan.

I'm considering shifting our sites data from the datastore across to Cloud SQL. 

Now I know it's still in beta but I'd love to be able to do this.

My main concern is around losing my data. Is that possibility whilst it's in beta?

Thanks in advance,

Matt