Well I found a thread here that seems to accomplish what you're asking. I can't put it any better than forum poster himself, so here's what he said in case the page isn't working:
I figured out a way to do this, so thought I would post for anyone
following me that has a bunch of VPN settings and doesn't want to
manually key them back in. You will basically have to copy & paste a
few GUIDs to make your old prefs data match your new system. This
worked for me going from one Mac OS X 10.6 SL system to another SL
system. I would imagine similar steps would work for Mac OS X 10.5
Leopard and possibly 10.7 Lion. Here we go:
First, go to Network Preferences on your new machine and add VPN (L2TP), VPN (PPTP), or whatever VPN "interfaces" you need. Do not
create any new VPN configurations at this time. Close Network Prefs.
Open System Profiler, select and copy to the clipboard the Hardware UUID from the Hardware tab.
Navigate to ~/Library/Preferences/ByHost and find your old NetworkConnections prefs file. It will have the form of
com.apple.networkConnect..plist. Make a copy of this
file. Replace the portion w/ the one you copied in
step #2. Don't forget to remove any spaces and the " copy" tag. You
should now have a new file called
com.apple.networkConnect..plist.
Open 2 files in an editor that can handle .plist files (I used TextWrangler): the com.apple.networkConnect..plist file
you just made, and
/Library/Preferences/SystemConfiguration/preferences.plist.
In preferences.plist, look for the GUID of each VPN interface that you've created. The "UserDefinedName" string at the end of the key
will tip you off:
<key>14A4B264-C231-41FE-857B-EE5557B69851</key> <dict> <key>DNS</key>
<dict/> <key>IPv4</key> <dict> <key>ConfigMethod</key>
<string>PPP</string> </dict> ... <key>UserDefinedName</key>
<string>VPN (L2TP)</string> </dict>
The first long string ("14A4B264...") is the part you need. Copy this
to the clipboard.
Now move over to your com.apple.networkConnect file. Find the key that has all of your old VPN settings for that VPN type contained
w/in it. Select all of the key name (which is the GUID of your VPN
interface on your old Mac), then paste to replace it w/ the new GUID.
Repeat steps 5 & 6 for each VPN interface you need. In my case, there were 2: L2TP and PPTP.
Save your changes and close the com.apple.networkConnect file. Close the preferences.plist file WITHOUT saving anything.
Open your Network Preferences, select your VPN interface(s), and you should see your past configurations.
Hope this helps you!
Yes, all of this is relatively easily done, if you're using Mountain Lion (which is free for you if your MacBook didn't come with it pre-installed).
What type of disk?
Since the new MBA has USB 3, I'd recommend a USB 3 drive. USB 3 has more than enough bandwidth for any hard drive, and all but the fastest SSDs. There's a large selection of USB 3 drives, and they're far cheaper than Thunderbolt drives.
Hard drives will definitely be cheaper and offer far more capacity per dollar, but if VM performance is very important to you, an SSD may be worth looking at, and SSD prices have fallen sharply lately, below the $1/GB barrier. An SSD will have minimal benefits as a Time Machine drive however. Depending on your budget and performance tolerances, you may want to get a hard drive, see how performance is, and if you find it's not sufficient, get a small SSD for your VM and use the hard drive for your Time Machine.
VMs and Time Machine on one disk
To set up one disk to use for your VMs and Time Machine, you'll need to partition it. Apple has a good guide on how to do this with Disk Utility. Make one partition with sufficient size for your VMs (you'll want to leave some room for expansion of course), then a second one with the remainder of your space for a Time Machine.
Once Disk Utility has partitioned these drives, it should mount them on your desktop and ask if you want to use them for Time Machine. Answer yes on whichever partition you intend to use for Time Machine (not both of course). There should be an encryption option during the setup process. If you're not prompted to use either partition for Time Machine, you can manually choose a disk in Time Machine preferences. See Apple's Mac 101: Time Machine article for more details.
Encryption
When you create a Time Machine backup, it will give you an option to encrypt the partition. However if you don't do that, or if you want to encrypt the other partition as well, you can do this directly from the Finder. Just right click on the drives you want to encrypt, and choose Encrypt from the context menu. It will prompt for a passphrase (don't forget it!), and encrypt in the background.
I think that should cover everything.
Best Answer
Here are some links on the Connection Manager to setup VPN connection and deployment to users.
https://technet.microsoft.com/en-us/library/cc752995(v=ws.10).aspx
https://support.microsoft.com/en-us/kb/2693643
https://technet.microsoft.com/en-us/library/dd672647(v=ws.10).aspx