[Lizard]

There is always a data loss risk with trying out pre-release software. (There's even a risk with released software!) That said, OmniFocus 2 Private Test will be relatively safe to test. As a side effect of some other work we needed to do, the OmniFocus 2 database, preferences and so forth are stored in a separate directory from the ones for OmniFocus 1. This means that you can have both apps running on your computer, talking to separate databases while you're first trying out OmniFocus 2. Then, as you get comfortable, and OmniFocus 2 stabilizes, you can set it up to sync to the same server database as OmniFocus 1 and your iOS devices.