The best replacement for system state is shadow copy components.

The best alternatives to system state are rated as following:
★★★★★  shadow copy components
★★★  full backup
★  asr
★  shadow copy
★  bare metal
  system restore

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Speaking about system state, one probably shouldn't forget about ntbackup.

Other search terms related to system state and their ratings are:
★★★★★ ntbackup
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system state
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