That's the one you want (for long term storage).
For me, USB sticks are ok but just as incidentals. The definitive security is:
[1] - keep a clean external boot drive that you never use and almost never goes online
[2] - create a 10mb encrypted drive image with a strong password that you can remember (i.e. not a random character one - one you can remember but that is still complex)
[3] - create your wallets and wotnot on the boot drive but still offline
[4] - encrypt the wallet
[5] - in 'debug' mode, use 'dumpprivkey' to get the private keys and print them (along with the public keys)
[6a] - create a folder in the encrypted drive and pop the wallet AND a text document containing the private key into it
[6b] - create a "Backup" folder inside that folder to hold past versions of the wallet
[7] - shutdown
***********END OF OFFLINE MODE **********
[8] - go online on your regular computer
[9] - send funds to the wallet address
[10] - copy the encrypted drive to your online backup (Google drive etc)
[11] - when you want to access your funds, do this:
- close all browsers and SKYPE !!! <-- very important
- unplug your network cable and switch off airport from the little quick access menu bar (or on Windows disable wi-fi)
- connect the external boot drive containing the encrypted drive, open the encrypted drive
- drag the wallet out into your main PC (or Mac) /home/Library/Application Support/darkcoin
- unmount the encrypted drive image <----- IMPORTANT BIT
[12] - go online, perform transfers and quit the wallet
*********** GO BACK OFFLINE **********
[13] - re-open the encrypted drive and move the wallet that was there into the 'backups' folder
[14] - COPY the live wallet (from the dark coin folder) into the encrypted drive
[15] - MOVE the live wallet to the desktop and place in a folder called "to be deleted"
[16] - unmount the encrypted drive
*********** FINAL STEP - NEW PAPER BACKUP AND VALIDATION THAT WE DIDN'T SCREW UP SOMEWHERE **********
[17] - launch the client and check that your special address ISN'T there (because you removed the 'live' wallet)
[18] - remount the encrypted drive
[19] - drag the current wallet out of the drive and back into /home/Library/Application Support/darkcoin
[20] - fire up the client and check that your funds are there (you can do this offline because we downloaded the block chain at step 9)
[21] - do dumpprivkey for all addresses (including the new change addresses) ( <-- IMPORTANT BIT)
[22] - print the paper wallet
[23] - update the text file in the encrypted drive with the new privkeys
Final Step
[24] - if everything went ok with the validation phase, delete the folder created at step [15] "to be deleted" and empty wastebasket
********* Encrypted Drive now contains updated wallet and electronic copy of paper wallet containing new changes addresses ********
[25] - copy encrypted drive image to USB sticks / google drive etc as required
[26] - disconnect hardware boot drive
********* Your main PC now contains no traces of any live wallet
********* Your backup drive contains the live wallet under 2 layers of encryption and the paper wallet under 1 layer of encryption
********* You have printed copies of the private keys if all your electronic backups disappear
[27] - go back online and continue browsing happily