Where can I get the cable, and is there any apps that will allow me to back up my contacts to my PC via a USB cable?
Your charging cable is also your data/connect-to-pc cable.
Google works in a cloud system and your contacts are saved via the cloud. So you don't have to backup your contacts.
If you don't feel safe with that option alone, there are apps that will allow you to backup various information on your phone.
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the cable came with your droid. usb/data cable, you may have it plugged into the outlet using it as a wall charger.
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You will use your pc for installing things into your SD card (or removing). You hook up the cable, you'll have a drop down on your Droid asking you if you want to mount, say yes, and your droid will pop up on your pc.
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Sorry for the dumb question, but my contacts were entered manually into my phone and they do not appear in my gmail account, so exactly how are they automatically backed up, and where in the cloud environment are they backed up.
Second question, how can I get all my contacts added to my gmail account. When I log into gmail on my pc, I do not see these contacts.