I just backed up those files with no problem.
Please make sure you use an administrator account and you start FBackup as administrator.
What is the error message you receive if you use as source the "config" folder?
Perhaps I should Clarify, this was tried in Windows Server 2008 R2 (Windows 7 64bit is the equivalent)
The Account is not "Administrator" but is an administrator of the machine.
I hacked the (ini) file to include the files I wanted;
(Note that the first two files (Test & Hosts) have icon's in the GUI but the last three files do not)
Group: My Backup Jobs
Ini file: C:\Users\TrackIQ\AppData\Roaming\Softland\FBackup 4\IniFiles\IISconfig.ini
Destination type: Local hard drive
Folder: G:\My Backup\
Catalog: G:\My Backup\IISconfig.fkc
Include all files.
Temporary Files - use as exclude
( File name = '*.tmp|*.temp|*.bak|*.chk|*.fkc-journal')
Clear archive bit: No
Folder name prefix: none
Fast mirror: Yes
Create full paths: No
Copy files in a subfolder: No
Remove excluded or deleted files from backup: Yes
Only if source drive is available: No
Zip the files: No
Copy NTFS security permissions: No
Copy NTFS alternate file streams: No
Allow file splitting when spanning: No
Sort mirror files for optimized spanning: No
Use local catalog: Yes
Test after backup: Yes
Delete sources after successful backup: No
Ask for backup label before execution: No
Backup open files: Yes
Store temporary catalog data in memory Yes
Backup execution priority: Normal priority
Action before backup: not enabled
Action after backup: not enabled
Comparison criteria: [Size, Date modified, Date created, Read-Only, Archived, Hidden, System]
Sounds: not enabled
Emails: not enabled
Show warning and error messages when scheduled: No
Abort backup when source drives are not available: No
Ask for user input when backup cannot continue: No
I've now removed IIS from the machine and will image a virtual machine instead.