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#11
If you don't want to go down the route of full encryption, you could also consider a folder locking/hiding utility to which the technician wouldn't have the password. As a tech wouldn't need access to your pictures, music, videos, docs you could just hide/lock those folders while giving the tech access to the system folders.
I haven't tried any of these myself but there are a few free ones.
Best Free Folder Hiding Utility | Gizmo's Freeware