There probably are several flash-backs. Regina had Sidney do some background research on Emma Swan early on in S1. We find out in 1×4 that Emma lived in 7 different places in the past decade since giving up Henry for adoption. The longest place she stayed in was two years – Tallahassee.
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"That’s how you know you’ve really got a home. When you leave it, there’s this feeling that you can’t shake. You just miss it." Neal Cassidy