CrashPlan doesn't support backing up mapped drives on Windows. CrashPlan runs as a Windows service and therefore cannot access drives mounted by a user. This is an OS-level restriction built into Windows.
If you would like to back up a mapped drive on Windows, this article describes an unofficial method for doing so. It is not supported by CrashPlan so proceed at your own risk.
This method for backing up a mapped drive requires advanced knowledge of Windows. It is not for beginners. If you don't feel comfortable using a command line, you should stop now.
The key element of the net use command is the /USER:ip\username syntax. Without the IP (or desktop name if Windows) it does not work.
The raw command is provided below (replace contents inside angle brackets and remove the angle brackets):
net use S: \\<device_ip_address>\<share_name> /USER:<device_ip_address>\<username> <password> C:\tmp\mount.log 2>&1 2>&1
Sample File Contents:
echo %date% %time% : "%cd%\mount.bat" >> C:\tmp\mount.log >&1 2>&1 net use S: \\10.10.42.50\plindqui /USER:10.10.42.50\plindqui <password> >> C:\tmp\mount.log 2>&1 2>&1
Note: If you create your batch file in Notepad, make sure you select All Files from the Save as Type menu. Otherwise, Windows interprets your batch file as a regular text file.
Now that you have your batch file, create the task on XP:
When you sign in with your Owner account you can see a network mapped drive that you don't have permission to read. It appears as disconnected. The “disconnected” drive is the mapping CrashPlan will be using.
In the CrashPlan destination / source file browser:
(optional) Of course, you can map it with your Owner account, so you can interact with the files. In this case the two mappings are both valid:
For Vista, the batch file remains the same, but the steps to create a scheduled task are different.