Multibit saving after transaction - what do wallet private key backups look like, if they exist? I sent some bitcoins from a multibit wallet to another wallet. I recently realized that the change not sent in this transaction is sent to a new address. This means I didn't back up the key of this new wallet.

I was wondering if this new address created would have auto-saved when I shut down multibit. If so what kind of name would it self save under?
In multibit, under the help menu option you can open the help contents. Under Wallet Backups you can read the following:


  MultiBit does this automatically in the background using special files that are described in detail in the File descriptions article. These files can often be used to recover your wallet automatically should a problem occur.


In the File Descriptions article you can read the following:


  For the purpose of illustration, imagine you have created a new wallet called saving.wallet. Please refer to the relevant help section for your version below (use the 'About MultiBit' menu option if required).
  
  Wallet files for MultiBit version 0.5.13 and later
  
  Here is a list of the files stored with your wallet:
  
  
  saving.wallet  =  This is the main wallet file containing your    private keys and transactions. 
  saving.info  =  This file contains the    description of the wallet and the labels you have given to your    addresses. 
  saving-data  =  A directory containing your wallet backup    files. 
  saving-data/key-backup  =  A directory containing your    automatically generated private key export files.    
  saving-data/rolling-backup  =  A directory containing your rolling    wallet backups. 
  saving-data/wallet-backup  =  A directory containing    your encrypted wallet backups. 
  saving-data/wallet-unenc-backup  =  A    directory containing your unencrypted wallet backups.
  
  
  Private key backups. In your private key backup directory you will have files called 'saving-YYYYMMDDHHMMSS.key'. Here the YYYYMMDDHHMMSS
  is a timestamp. With an encrypted wallet every time you add or change
  the password, add a receiving address or import private keys an
  encrypted, timestamped export of your private keys is created. This is
  encrypted with your wallet password. You can use these to recover the
  essentials of your wallet by importing one of these files into a new
  wallet.


This should at least put you in the right direction.