Done. 
Really appreciate the help, I was sweating for a minute there!
Electrum seems so streamlined after coming from a dated version of Multibit. Are my private keys still the same as the one from my old wallet, or should I back this new one up?
Can you confirm that you used "sweep" to get your coins from MultiBit to Electrum... and that you didn't use the "import" feature?Really appreciate the help, I was sweating for a minute there!
Electrum seems so streamlined after coming from a dated version of Multibit. Are my private keys still the same as the one from my old wallet, or should I back this new one up?
If you used "sweep", this will have created a transaction on the blockchain and your coins are now in a new wallet in new address(es) with new private key(s). As ranochigo pointed out, everything you now do in Electrum will be able to be restored from your "12 word seed"... write that seed down and keep it safe!
If you used "import", your coins are still controlled by your old private keys and you will have to continue to back up your wallet file.