Flight plans are stored in the data/iFly.GOS/files/iFly/#FlightPlans folder (if you save to the external SD that will be prefaced by the external sd data path, ie: /mnt/sdcard_ext/Android, or similar). This is easily copied off to another device (bluetooth, wifi direct, or using an intermediary computer).
Sadly settings and user waypoints are stored in app storage (this is a sandboxed storage dedicated to each app and cannot easily be accessed by other apps). If your tablet is rooted, you'll find the files in /data/data/iFly.GPS/files/iFly/Assets
I use Total Commander to browse my tablet and synchronize ultimate. Each time I walk into my house and my tablet detects my home network it automatically syncs my tablet to my computer. One of the many folders it synchronizes is iFly waypoints, flightplans, tracks and logs (which I use for certain reporting requirements). Also syncs my music and pictures :)
Security will always be in direct opposition to convenience (ever experience having to unlock your front door while carrying groceries and having drunk too much coffee?). However, any security can be overcome. Just be aware of the risks you take, messing with these folders can be dangerous to your health.