I think it would also need to refer to your company policy, about whether the staff can copy the company data/resource to their home pc; and there should be a measurement in forcing the home PCs with AV sw and security patch installed... bababa....
Anyway, I would recommend allowing the users to access their office own PC thru RDP or VNC only, so that they are no need to copy from and copy back to the company server, the most important point is, you can teach them how to use the RDP (pre-loaded in XP) with the standardized computer name format like ' General_Tab' on the RDP dialog~

Once they are connected to their office PC, they are bound by the company policy / FW policy to handle the company data~