Here are some previous coments made on this forun regarding backup of a Boot Camp partition. I use Paragon HDMSuite 2011.
Casper 6 does seem to work;
WinClone was handy for XP users but doesn't for instance check for errors during the backup only during restore. Winclone was discontinued at 2.2, all 2.3 versions are hacks (removal of the OS check seems to be the main thing) There has been no deveoplment or support for a while now.
Acronis 2011 w/ plus pak, didn't work well previously
Ghost 15 - probably not
Casper 6 works for Windows on Boot Camp only
CopyCatX is more lengthy and sector copy so takes the longest.
Paragon Hard Drive Suite 2011 because it works great
and they have CampTune
Windows 7 system backup and restore - Apple's goofy HFS read-only interferes with system and file backup.
I have also used Casper, Clonezilla and Paragon but less regularly, Casper failed a few times, I stopped using it, Clonezilla worked but took forever (for me) Paragon (which I have only used twice) was the best but my sample is limited.
I have restored from DU, CCC, SuperDuper and TM, they all worked, TM was slower but not a lot, you can boot from the others, which I prefer.
HDM 2011 can do either offline or online backups, the difference is that with an offline backup, the entire partition (or disk) is unallocated. In an online backup, the backup utility is running against a partition that may be making changes to itself. When you run CCC or SD! in OS X, you're running an online backup. However, I would recommend (at least for the first backup) that you boot from the HDM recovery CD to do an offline backup. This will ensure that you have an *exact* copy of the parition/disk.
Since this is you first time backing up your partition, I would suggest using one of the Backup Wizards. They'll guide you through the backup process and keep you from doing something wrong Similarly, use the Restore Wizard to restore your partition/drive.
HDMS 2011- back up a dual-boot Mac to an external USB drive, do:
1) Boot from the Recovery Disk (I'm assuming that the backup hard drive is attached before you reboot)
2) Select Paragon Hard Disk Manager
3) Launch the Backup Wizard by selecting Wizards > Backup Wizard
4) Select the Mac hard disk (not the partition) where it asks "what to backup"
5) On the Backup Destination page, select "Save data to any local drive or a network share"
6) Hit the radio button for the "Save to local drive option" (unless you got a boatload of DVD's )
7) Select the external USB drive as the backup destination
8) Look over and correct the name and comments
9) Hit Next to start the backup
When it's done, you have an entire copy of your Mac's HD saved to external media.
If you need to recover your HD, just run the Recovery Wizard and reverse the process.