diff --git a/pandalib-paper/src/main/java/fr/pandacube/lib/paper/modules/backup/BackupCleaner.java b/pandalib-paper/src/main/java/fr/pandacube/lib/paper/modules/backup/BackupCleaner.java
index e4b2203..a17549d 100644
--- a/pandalib-paper/src/main/java/fr/pandacube/lib/paper/modules/backup/BackupCleaner.java
+++ b/pandalib-paper/src/main/java/fr/pandacube/lib/paper/modules/backup/BackupCleaner.java
@@ -33,7 +33,7 @@ public abstract class BackupCleaner implements UnaryOperator<TreeSet<LocalDateTi
                 return localDateTimes.stream()
                         .collect(Collectors.groupingBy(
                                 ldt -> {
-                                    return ldt.getYear() * 4 + ldt.getMonthValue() / 2;
+                                    return ldt.getYear() * 4 + ldt.getMonthValue() / n;
                                 },
                                 TreeMap::new,
                                 Collectors.minBy(LocalDateTime::compareTo))