Usually it's Dropbox and 1Password. I think I need Dropbox on there first to get my data in 1Password to work. I think FindMyiPhone already is ON the phone so I just activate that.
If the 1Password app allows you to drag n drop to your desktop via iTunes like DataVault does, you won't need Dropbox in this regard. Just drag n drop a local backup of the app onto your desktop and then drag n drop it back after installing the app on your new device, if applicable. I have the app downloaded, but have yet taken the time to experiment with it....
