Confirmed here
Error (500) Something went wrong. Don't worry, your files are still safe and the Dropboxers have been notified.
Dropbox suffered a major outage across the globe today – the company blamed "routine internal maintenance" for the significant wobble, which appears to be ongoing. At time of publication, Dropbox was claiming on its official status page that services were running normally again. However, a quick scan of "Dropbox down" tweets …
In any case unless you have only ever used the web interface (which is unlikely) or have deliberately only "selective sync"'d certain parts of your Dropbox contents you'll have a complete copy of your files on a machine you own.
I'm immediately sceptical of anything "cloudy" but Dropbox does generally work pretty well for some businesses who haven't the resources to run their own solution.
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DB going down only means (for the vast majority) that your local changes are not getting backed up for a few hours. Probably not a big deal.
There will be a few people who need to sync to a new device - setting up a new PC or something - but that will be a tiny minority in the timescale in question.