Backup of my Droid X How (What App) do I use in order to do backup? What is good backup apps out there? I primarily want to save calling logs &amp; SMSs, as all of Applications I can just re-download from Market.

I use Droid X!
Titanium Backup is probably the best.  It can back up and restore data like SMSs and call logs.  It can back up the apps themselves too, which is much easier than making a list (or trying to remember) and manually restoring them.  There are others but I don't think any can compare to TB.