The best replacement for hot spare is standby hot spare.

The best alternatives to hot spare are rated as following:
★★★★★  standby hot spare
★★★★  cold spare
★★★★  raid 6
★★★★  hot swap
★★★  raid 1
★★  not hot spare
★  dedicated hot spare
★  global hot spare

Your alternative for hot spare is not listed? Suggest!
Speaking about hot spare, one probably shouldn't forget about raid 1.

Other search terms related to hot spare and their ratings are:
★★★★★ raid 1
★★★ raid 5
★★★ raid
★★★ raid 6
★★★ raid 0
★★ raid 10
You have in mind a companion for hot spare and it is not yet here? Propose!



Google Trends

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hot spare
standby hot spare
cold spare