Encryption is important in a Dropbox-based notetaking tool because, like every hugely popular web service, Dropbox has had security issues.
And recent revelations about the power of the NSA to access our online data makes encryption an important feature no matter where you're storing your data.
This is a new feature, so at first you should be careful using it, in case there are any security issues. In the early testing we found one serious issue. There may be others.
Now you can use Fargo for new applications that require security. For example, storing passwords and confidential documents.