Time Machine by default, will use all the available disk space on an external drive or a external server volume. You can setup a limit how much disk space Time Machine may use. Use this defaults write Terminal command:
defaults write /Library/Preferences/com.apple.TimeMachine MaxSize 405600
Where MaxSize 405600 is the MB equivalent of 400GB (400 * 1024)
To remove the limit:
defaults delete /Library/Preferences/com.apple.TimeMachine MaxSize
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