There are some types of files that CrashPlan excludes from backing up (called Admin Excludes) or hides from the file selection list (Hidden Files). You cannot change these settings. All patterns are in Java Regular Expression format.

The files and folders that match the listed patterns are excluded on all platforms and cannot be selected for backup.

.*/(?:42|\d{8,})/(?:cp|~).*
(?i).*/CrashPlan.*/(?:cache|log|conf|manifest|upgrade)/.*
.*\.part
.*/iPhoto Library/iPod Photo Cache/.*
.*\.cprestoretmp.*
*\.rbf
:/Config\\.Msi.*
.*/Google/Chrome/.*cache.*
.*/Mozilla/Firefox/.*cache.*

.*\$RECYCLE\.BIN/.*
.*/System Volume Information/.*
.*/RECYCLER/.*
.*/I386.*
.*/pagefile.sys
.*/MSOCache.*
.*UsrClass\.dat\.LOG
.*UsrClass\.dat
.*/Temporary Internet Files/.*
(?i).*/ntuser.dat.*
.*/Local Settings/Temp.*
.*/AppData/Local/Temp.*
.*/AppData/Temp.*
.*/Windows/Temp.*
(?i).*/Microsoft.*/Windows/.*\.log
.*/Microsoft.*/Windows/Cookies.*
.*/Microsoft.*/RecoveryStore.*
(?i).:/Config\\.Msi.*
(?i).*\\.rbf
.*/Windows/Installer.*

/dev/.*
.*\.Trash.*
/\.vol/.*
/mach.sym
/mach_kernel
.*\.hotfiles\.btree.*
.*/Trash/.*
.*/Network Trash Folder/.*
.*/VM Storage
.*\.fseventsd.*
.*/Library/Caches/.*
.*\.Spotlight-.*/.*
/Network/.*
/tmp/.*
/cores/.*
/afs/.*
/automount/.*
/private/Network/.*
/private/tmp/.*
/private/var/tmp/.*
/private/var/folders/.*
/private/var/run/.*
/private/var/spool/postfix/.*
/private/var/vm/.*
/Previous Systems.*
.*/lost\+found/.*
.*/Microsoft User Data/Entourage Temp/.*
.*/iP.* Software Updates/.*
.*/Library/Application Support/SyncServices/.*
.*/Library/Logs/.*
.*/Library/Mail/Envelope Index
.*/Library/Mail/AvailableFeeds/.*
.*/Library/Mirrors/.*
.*/Library/PubSub/Database/.*
.*/Library/PubSub/Downloads/.*
.*/Library/PubSub/Feeds/.*
.*/Library/Safari/Icons.db
.*/Library/Safari/WebpageIcons.db
.*/Library/Safari/HistoryIndex.sk
.*/Library/Calendars/Calendar Cache 

/sys/.*
/dev/.*
/proc/.*
/tmp/.*
.*/lost+found/.*

/sys/.*
/dev/.*
/proc/.*
/tmp/.*
.*/lost+found/.*

Hidden files are not displayed by default from the backup file selection. Enable Show Hidden Files to view and select hidden files.

.*/\..*
(?i).*\.tmp
(?i).*/temp/
(?i).*/tmp/

(?i).:/Config\.Msi/
.:/ProgramData/
.*Thumbs\.db
.*/Local Settings/History/
.*/NetHood/
.*/PrintHood/
.*/Cookies/
.*/Recent/
.*/SendTo/
.*/LocalService/
.*/NetworkService/
.*/Start Menu/
(?i).*/NTUSER.*
(?i).:/WINDOWS/
(?i).:/autoexec.bat   

/bin/
/etc/
/sbin/
/usr/
/sw/
/System/
/private/
/Desktop DB
/Desktop DF

/bin/
/boot/
/etc/
/initrd/
/lib/
/opt/
/sbin/
/usr/
/var/
/srv/

/bin/
/boot/
/etc/
/initrd/
/lib/
/opt/
/sbin/
/usr/
/var/
/srv/