backup.md: remove info about replication

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• Close #180
• Staging: https://docs.binary.picodata.io/picodata/branch-fix_backup/

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assigned to @a.tolstoy

requested review from @rosik

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• 506c716a - Apply 1 suggestion(s) to 1 file(s)

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approved this merge request

added 3 commits

• 81b3567b - 1 commit from branch main
• eeb25e87 - backup.md: remove info about replication
• fc58d30e - Apply 1 suggestion(s) to 1 file(s)

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merged