The best replacement for fatback is salt pork.

The best alternatives to fatback are rated as following:
★★★★★  salt pork
★★★★  907
★★★  9 zero 7
★★★  pugsley
★★  mukluk
★★  lard
★  moonlander
★  9zero7
★  back fat
  boatneck

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Speaking about fatback, one probably shouldn't forget about collard greens.

Other search terms related to fatback and their ratings are:
★★★★★ collard greens
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Google Trends

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fatback
salt pork
907