You can turn any network attached storage device into a Time Machine back-up drive with one simple step.
Simply download this app package and drag your drive onto it. The script adds the drive as a Time Machine capable device and then you can simply add it under Time Machine System Preferences.
The full script is right here if you want to roll your own:
on open names
set volumeName to names as text
set macAddress to (do shell script "ifconfig en0 | grep ether | tr -d '\11' | sed s/ether// | sed 's/ //g' | sed s/://g")
set hostName to (do shell script "hostname -fs")
tell application "Finder"
set theSize to round (((capacity of startup disk) / 1024 / 1024) / 1024)
end tell
do shell script "defaults write com.apple.systempreferences TMShowUnsupportedNetworkVolumes 1" with administrator privileges
do shell script "sudo hdiutil create -size " & theSize & " -type SPARSEBUNDLE -nospotlight -volname \"Backup of " & hostName & "\" -fs \"Journaled HFS+\" ~/" & hostName & "_" & macAddress & ".sparsebundle" with administrator privileges
do shell script "mv ~/" & hostName & "_" & macAddress & ".sparsebundle /Volumes/" & volumeName & "/" with administrator privileges
tell application "Finder" to eject volumeName
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tell application "System Preferences"
activate
end tell
tell application "System Events"
tell application process "System Preferences"
set frontmost to true
click menu item "Time Machine" of menu "View" of menu bar 1
end tell
end tell
end open
