br: restore checksum shouldn't rely on backup checksum (#56712)#57887

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ti-chi-bot wants to merge 1 commit intopingcap:release-7.5from ti-chi-bot:cherry-pick-56712-to-release-7.5

+1,758-58

Commits on Dec 2, 2024

This is an automated cherry-pick of pingcap#56712

Tristan1900
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ti-chi-bot
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