I do mostly field work and some clients can be hesitant about sensitive data, especially acct'ing, being copied over to one of my laptops. So I use bootdisks and usb drives to do backups generally, then run chkdsk in an attempt to prepare the file system for ghosting. Reinstalling from scratch is less profitable from my standpoint and I get less whining if I manage to restore the computer to it's former state.
The bulk of my work is also onsite, however when it comes to sensitive data, company secrets or banking details on a failed hard drive - My clients are not concered with what I am going to do with the information least of all copy it to my computer for recovery.... In fact they would encourage me to do anything i can to recover said information - Perhaps people in Australia trust too much... ?

Although, I couldnt imagine being in this field without my clients having trust in my professionalism or skills.