This is the exclude list I used for XP and 7, might be worth a try

$Conf{BackupFilesExclude} = {
  '*' => [
    '/Documents and Settings',
    '/ProgramData/Application Data',
    '/ProgramData/Desktop',
    '/ProgramData/Documents',
    '/ProgramData/Favorites',
    '/ProgramData/Start Menu',
    '/ProgramData/Templates',
    '/Users/All Users',
    '/Users/Users/Default User',
    '/Users/Users/All Users/Application Data',
    '/Users/Users/All Users/Desktop',
    '/Users/All Users/Documents',
    '/Users/All Users/Favorites',
    '/Users/All Users/Start Menu',
    '/Users/All Users/Templates',
    '/Users/*/Application Data',
    '/Users/*/Cookies',
    '/Users/*/Local Settings',
    '/Users/*/My Documents',
    '/Users/*/NetHood',
    '/Users/*/PrintHood',
    '/Users/*/Recent',
    '/Users/*/SendTo',
    '/Users/*/Start Menu',
    '/Users/*/Templates',
    '/Users/*/AppData/Local/Application Data',
    '/Users/*/AppData/Local/History',
    '/Users/*/AppData/Local/Temporary Internet Files',
    '/Users/*/Documents/My Music',
    '/Users/*/Documents/My Pictures',
    '/Users/*/Documents/My Videos',
    '/Users/*/AppData/Local/Microsoft/Windows/Temporary Internet Files',
    '/Users/*/AppData/Local/Temp',
    '/Users/*/NTUSER.DAT*',
    '/Users/*/ntuser.dat*',
    '/Users/*/AppData/Local/Microsoft/Windows/UsrClass.dat*',
    '/Users/*/AppData/Local/Microsoft/Windows Defender/FileTracker',
    '/Users/*/AppData/Local/Microsoft/Windows/Explorer/thumbcache_*.db',
    '/Users/*/AppData/Local/Microsoft/Windows/WER',
    '/Users/*/AppData/Local/Mozilla/Firefox/Profiles/*/Cache',
    '/Users/*/AppData/Local/Mozilla/Firefox/Profiles/*/OfflineCache',
    '/Users/*/AppData/Roaming/Microsoft/Windows/Cookies',
    '/Users/*/AppData/Roaming/Microsoft/Windows/Recent',
    'ProgramData/Microsoft/Search',
    'ProgramData/Microsoft/Windows Defender',
    '*.lock',
    'Thumbs.db',
    'IconCache.db',
    'Cache*',
    'cache*',
    '/Program Files',
    '/Windows',
    '/$Recycle.Bin',
    '/MSOCache',
    '/System Volume Information',
    '/Boot',
    '/autoexec.bat',
    '/bootmgr',
    '/BOOTSECT.BAK',
    '/config.sys',
    '/hiberfil.sys',
    '/pagefile.sys',
    '/AppData'
  ]
};