diff --git a/backend/src/main/java/com/sysadmin/monitor/MonitorApplication.java b/backend/src/main/java/com/sysadmin/monitor/MonitorApplication.java
index 3c4c4ad..e72d655 100644
--- a/backend/src/main/java/com/sysadmin/monitor/MonitorApplication.java
+++ b/backend/src/main/java/com/sysadmin/monitor/MonitorApplication.java
@@ -2,8 +2,10 @@
 
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.scheduling.annotation.EnableScheduling;
 
 @SpringBootApplication
+@EnableScheduling
 public class MonitorApplication {
 
     public static void main(String[] args) {
diff --git a/backend/src/main/java/com/sysadmin/monitor/repository/SystemMetricRepository.java b/backend/src/main/java/com/sysadmin/monitor/repository/SystemMetricRepository.java
index 4c8e04e..029d56c 100644
--- a/backend/src/main/java/com/sysadmin/monitor/repository/SystemMetricRepository.java
+++ b/backend/src/main/java/com/sysadmin/monitor/repository/SystemMetricRepository.java
@@ -4,9 +4,12 @@
 import com.sysadmin.monitor.entity.SystemMetric;
 import org.springframework.data.domain.Pageable;
 import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Modifying;
 import org.springframework.data.jpa.repository.Query;
 import org.springframework.stereotype.Repository;
+import org.springframework.transaction.annotation.Transactional;
 
+import java.time.LocalDateTime;
 import java.util.List;
 
 @Repository
@@ -16,9 +19,13 @@ public interface SystemMetricRepository extends JpaRepository<SystemMetric, Long
 
     List<SystemMetric> findByHostnameOrderByTimestampDesc(String hostname, Pageable pageable);
 
+    @Modifying
+    @Transactional
+    long deleteByTimestampBefore(LocalDateTime limite);
+
     @Query("SELECT DISTINCT m.hostname FROM SystemMetric m ORDER BY m.hostname")
     List<String> findDistinctHostnames();
 
     @Query("SELECT new com.sysadmin.monitor.dto.MetricSummaryDTO(m.hostname, AVG(m.cpuUsage), MAX(m.cpuUsage), AVG(m.ramUsage), MAX(m.ramUsage), AVG(m.diskUsage), MAX(m.diskUsage)) FROM SystemMetric m GROUP BY m.hostname ORDER BY m.hostname")
     List<MetricSummaryDTO> findSummaryByHost();
-}
\ No newline at end of file
+}
diff --git a/backend/src/main/java/com/sysadmin/monitor/service/MetricService.java b/backend/src/main/java/com/sysadmin/monitor/service/MetricService.java
index be38bf1..9e7af53 100644
--- a/backend/src/main/java/com/sysadmin/monitor/service/MetricService.java
+++ b/backend/src/main/java/com/sysadmin/monitor/service/MetricService.java
@@ -31,6 +31,9 @@ public class MetricService {
     @Value("${monitor.alerts.ram:90}")
     private double ramThreshold;
 
+    @Value("${monitor.retention.days:7}")
+    private int retentionDays;
+
     public SystemMetric saveMetric(SystemMetricDTO dto) {
 
         SystemMetric metric = SystemMetric.builder()
@@ -119,6 +122,15 @@ public List<AlertDTO> getAlerts() {
         return alerts;
     }
 
+    public long deleteOldMetrics() {
+        LocalDateTime limite = LocalDateTime.now().minusDays(retentionDays);
+        long borradas = metricRepository.deleteByTimestampBefore(limite);
+
+        log.info("Retencion - borradas {} metricas anteriores a {}", borradas, limite);
+
+        return borradas;
+    }
+
     public List<String> getHostnames() {
         return metricRepository.findDistinctHostnames();
     }
diff --git a/backend/src/main/java/com/sysadmin/monitor/task/RetentionTask.java b/backend/src/main/java/com/sysadmin/monitor/task/RetentionTask.java
new file mode 100644
index 0000000..e693456
--- /dev/null
+++ b/backend/src/main/java/com/sysadmin/monitor/task/RetentionTask.java
@@ -0,0 +1,18 @@
+package com.sysadmin.monitor.task;
+
+import com.sysadmin.monitor.service.MetricService;
+import lombok.RequiredArgsConstructor;
+import org.springframework.scheduling.annotation.Scheduled;
+import org.springframework.stereotype.Component;
+
+@Component
+@RequiredArgsConstructor
+public class RetentionTask {
+
+    private final MetricService metricService;
+
+    @Scheduled(cron = "${monitor.retention.cron:0 0 4 * * *}")
+    public void limpiarMetricasAntiguas() {
+        metricService.deleteOldMetrics();
+    }
+}
diff --git a/backend/src/main/resources/application.properties b/backend/src/main/resources/application.properties
index 2ce99ff..fbbab98 100644
--- a/backend/src/main/resources/application.properties
+++ b/backend/src/main/resources/application.properties
@@ -10,3 +10,7 @@ spring.jpa.properties.hibernate.format_sql=true
 # umbrales de alerta en porcentaje
 monitor.alerts.cpu=85
 monitor.alerts.ram=90
+
+# retencion: borramos las metricas de mas de 7 dias cada noche a las 4
+monitor.retention.days=7
+monitor.retention.cron=0 0 4 * * *