From eyes-free list member Tomi:
It is quite simple to export your labels:
Using adb, adb shell into your phone. Type su, then:
mkdir /sdcard/tbackup
cp -r /data/data/com.google.android.marvin.talkback/* /sdcard/tbackup
This will back up all of your talkback databases and preferences. To
restore on a new phone: after having root,
cp -r /dsdcard/tbackup /data/data/com.android.marvin.talkback
I have used this before, though not as of recent (maybe in 4.2.X)?
Once again, this is one way in which the power of root is benefitial
for Android users!