I know the phone was released with Android 2.3.x, but did it upgrade to 4.x at any point? If yes, Helium backup on Play should allow you to backup apps and data pre reset.
If no, what exactly are you looking to backup?
You can reset by hitting menu -> settings -> privacy -> factory data reset.
csv is a simple excel spreadsheet (in laymans terms).
Open your contacts/people app and hit the menu button, is there an import/export option.
If yes, select export to SD Card and it will create a csv file on your sd card.
Copy the file it creates to your PC, then open the gmail contacts link I gave earlier, then click more, import and select the file you just copied to your PC.
When you reset your phone and link it to your gmail account, the contacts should appear after a little while.
Really sorry for missing your question for so long btw
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