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.* 
.*/Music/Subscription/.* 
(?i).*/Google/Chrome/.*cache.* 
(?i).*/Mozilla/Firefox/.*cache.* 
.*/Google/Chrome/Safe Browsing.* 

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

mac:/dev/.* 
mac:.*\.Trash.* 
mac:/\.vol/.* 
mac:/mach.sym 
mac:/mach_kernel 
mac:.*\.hotfiles\.btree.* 
mac:.*/Trash/.* 
mac:.*/Network Trash Folder/.* 
mac:.*/VM Storage 
mac:.*\.fseventsd.* 
mac:.*/Library/Caches/.* 
mac:.*\.Spotlight-.*/.* 
mac:/Network/.* 
mac:/tmp/.* 
mac:/cores/.* 
mac:/afs/.* 
mac:/automount/.* 
mac:/private/Network/.* 
mac:/private/tmp/.* 
mac:/private/var/tmp/.* 
mac:/private/var/folders/.* 
mac:/private/var/run/.* 
mac:/private/var/spool/postfix/.* 
mac:/private/var/vm/.* 
mac:/Previous Systems.* 
mac:.*/lost\+found/.* 
mac:.*/Microsoft User Data/Entourage Temp/.* 
mac:.*/iP.* Software Updates/.* 
mac:.*/Library/Application Support/SyncServices/.* 
mac:.*/Library/Logs/.* 
mac:.*/Library/Mail/Envelope Index 
mac:.*/Library/Mail/AvailableFeeds/.* 
mac:.*/Library/Mirrors/.* 
mac:.*/Library/PubSub/Database/.* 
mac:.*/Library/PubSub/Downloads/.* 
mac:.*/Library/PubSub/Feeds/.* 
mac:.*/Library/Safari/Icons.db 
mac:.*/Library/Safari/WebpageIcons.db 
mac:.*/Library/Safari/HistoryIndex.sk 
mac:.*/Library/Calendars/Calendar Cache 
mac:.*/iTunes/Album Artwork/Cache/.* 
mac:.*/iPhoto Library/iPod Photo Cache.* 
mac:(?i).*/backups.backupdb 
mac:/Desktop DB 
mac:/Desktop DF 
mac:/Network/Servers.* 
mac:/Users/Shared/SC Info.* 
mac:/net/.* 
mac:/private/var/automount/.* 
mac:/private/var/db/dhcpclient/.* 
mac:/private/var/db/fseventsd/.* 
mac:/System/Library/Extensions/Caches/.* 
mac:.*Mobile.*Backups/.* 
mac:.*/Library/Saved Application State/.* 
mac:.*/Library/Mail/.*/Info.plist 
mac:.*/Library/Calendars/.*/Info.plist 

linux:/sys/.* 
linux:/dev/.* 
linux:/proc/.* 
linux:/tmp/.* 
linux:.*/lost\+found/.* 
linux:/selinux/.* 

solaris:/sys/.* 
solaris:/dev/.* 
solaris:/proc/.* 
solaris:/tmp/.* 
solaris:.*/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/