I cannot go through 40 levels of Andry Birds for third time.
1. First I sold 16GB and bought 64Gb and lost all game progress as BB desktop manager would not back up data
2. Then I locked myself out of Playbook and Playbook erased all my data
3. Now 2.0 is coming out !
I refused playing the same levels over and over again. [i get better though ]
no i know. it was totally stupid. i was playing with password on my playbook put something in there that i did not remembered. anyways, 10 tries and bye, bye data.
There is no reason to be concerned that an upgrade from 1.0.8 to 2.0 will affect your data. You don't need to do a backup, though it's a good idea, since your data will remain intact through the upgrade.
If you're currently on the beta, and especially if you've rooted it, I personally recommend you do a security wipe and "debrick" to restore it to 1.0.8 prior to the release, or do it after the upgrade to ensure a completely clean system, but this isn't required either.