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I logged into the app today and my data is intact. It's also there when I logged into Fitbit.com on my computer. The data is stored in the cloud so it shouldn't be lost even though the servers were down for a few hours.
Hi, @SunsetRunner , usually when folks report that they have lost all data it turns out that they accidentally set up a new account rather than logging in to their usual account. I would advise trying to think of any other email address you might have used and try that. As mentioned by @lmacmil once data is synced to your Fitbit account it is stored on the Fitbit servers rather than in your app. I also was affected by issues yesterday but all my data is still there. This is what I would expect.
Sense, Charge 5, Inspire 2; iOS and Android