Backup from different hard drives on Windows

[pbn1k]

First, I’d like to thank the developers for their hard work.

I need to backup two folders located on different hard drives. My file list:

C:/directory1
D:/directory2

I use the following command:

rdiff-backup.exe backup --include-globbing-filelist C:/path/to/filelist 
--exclude '**' C:/ E:/

Unsurprisingly, this command fails because the list contains a directory on 
drive D. I can only choose one drive as source (in this case C) because there’s 
no equivalent of a Linux root directory in Windows (“/”).

How do I solve this?

Thanks in advance,Johan