Windows 2000 & 2003 & 2008 Domain Controller
%windir%\ntds\Ntds.dit
%windir%\ntds\Ntds.pat
%windir%\ntds\EDB*.log
%windir%\ntds\Res1.log
%windir%\ntds\Res2.log
%windir%\ntds\Temp.edb
%windir%\ntds\Edb.chk
%systemroot%\sysvol (only this folder, not all subfolders!!!)
%systemroot%\sysvol\domain\DO_NOT_REMOVE_NtFrs_PreInstall_Directory
%systemroot%\sysvol\staging
%systemroot%\sysvol\staging areas
%systemroot%\sysvol\sysvol
Clusters:
%windir%\Cluster
Q:\ (quorum)
DHCP: %windir%\system32\dhcp
DNS: %windir%\system32\dns
WINS: %windir%\system32\wins
Exchange Server:

Cdb.exe
Cidaemon.exe
Store.exe
Emsmta.exe
Mad.exe
Mssearch.exe
Inetinfo.exe
W3wp.exe
Exchsrvr\Conndata
Exchsrvr\Mailroot
Exchsrvr\Mdbdata
Exchsrvr\Mtadata
Exchsrvr\server_name.log
Exchsrvr\Srsdata
%systemroot%\IIS Temporary Compressed Files
%SystemRoot%\System32\Inetsrv
All .edb; .stm (on Exchange 2000 Server); .log Exchange files
M: drive (on Exchange 2000 Server)
Windows SmallBusinessServer:
C:\Program Files\Microsoft Windows Small Business Server\Networking\POP3\Failed Mail
C:\Program Files\Microsoft Windows Small Business Server\Networking\POP3\Incoming Mail
SQL Server: SQL Server data files that have the .mdf extension, the .ldf extension, and the .ndf extension

WSUS: MSSQL$WSUS and WSUS content directory