How to create a disk image for flash drive backup

I tried to follow the instructions here – http://www.apple.com/uk/pro/tips/lockyourdata.html – without success. How do I encrypt the contents of my memory stick?

There is another way to do this if you are a bit adventurous: the terminal. I don't have a lot of experience using the terminal for this, but I just tried it, and it worked, and very quickly (a few seconds to create a 5 gig sparse image). The "terminal" is in utilities, and gives you access to the UNIX underpinnings of os x. OS X is essentially a GUI for UNIX. If you decide to try this, be very careful, and enter the commands exactly as written.
1. make sure you have a backup of your folder that you want to encrypt.
2. a backup of your whole system wouldn't be a bad idea either
3. open terminal (applications> utilities)
4. select the following line:
hdiutil create -encryption -size 5g -type SPARSE -fs HFS+ -volname Image ~/Desktop/image
6. Do not select any spaces before the first "h" or after the last "e".
6.5 do command-C to copy what you just selected.
7. go back to terminal. You should see something like this:
arthurs-mac-mini:~ arthur$ (and then a little grey square)
8. In my case, the "arthurs-mac-mini" is the name of my computer, and the "arthur$" is the user account currently logged in. the grey square is like the cursor.
9. paste the line you copied and hit return
10. it should prompt you twice to enter a password. enter it and hit return after each.
11. your new sparse image should appear on your desktop. If you like you can change the name of it from "image" to something else.
12. you can then open the image and copy your folder contents to it. The image should resize itself automatically to whatever you put in it.
13. hope this helps. let me know how it turns out.

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