Chris,
According to the help file below, you should be able to do
drive_letter:\userhome\*\archive
--------------------
File Backups
Enter one pathname per line.
Start all pathnames with the drive letter followed by a colon (:) and a backslash (\). The drive letter can be either upper or lower case.
c:\
Precede each component in the path with a backslash.
If the last component in the path is a directory, also follow it with a backslash (\). The trailing backslash is not required but serves as a reminder that the file path is a directory instead of a file.
c:\users\net1\
If the last component is a file, include the file extension and omit the backslash from the end of the name.
c:\special\list.txt
Upper and lower case letters in the pathname must match those in the pathname on the client. The only exception is the drive letter, which can be either upper or lower case.
c:\Worklists\Admin\
You can use the same wildcard characters as in Windows pathnames:
*
?
The following backs up all files ending with .doc
c:\Users\*.doc
The following backs up all files named log01_03, log02_03, and so on.
c:\system\log??_03
To back up all local drives except for those that use removable media, specify:
:\ or *:\ or ALL_LOCAL_DRIVES
The drives that are not backed up include: floppy disks, CD-ROMs and drives that are located on remote systems but mounted on your system through the network.
The following is an example backup selection list that uses the Microsoft Windows conventions:
c:\
d:\workfiles\
e:\Special\status
c:\tests\*.exe