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use 5.010;

    if ($input =~ /^(y|yes)$/) {
        say "Backup is beginning...";
...
        say "This is not a valid answer.";
        say "Please enter 'yes' or 'no'";
    }

    if ($input eq 'y' || $input eq 'yes') {
        say "Backup is beginning...";
        last;
    }