if you just flashed 2.1.2 over 2.0d or 2.1.1 i dont think it will delete anything. you need to WIPE if you want to delete everything and have a fresh start.
The advantage to wiping is to have a clean start. Fresh ROMs don't need be wiped if you are applying them on top of a previous Fresh ROM. Others may vary. Some others require a wipe to work correctly as it gets rid of lingering code that may cause problems.
Good Luck!
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