diff --git a/include/BackupIncrements.h b/include/BackupIncrements.h
index 02f824bb77..e9a930727e 100644
--- a/include/BackupIncrements.h
+++ b/include/BackupIncrements.h
@@ -135,7 +135,7 @@ public:
     typedef class IncIterator inc_iterator;
 
 private:
-    ExtendedAttribute * attribute_factory(VectorAttribute * va, int id) const
+    ExtendedAttribute * attribute_factory(VectorAttribute * va, int id) const override
     {
         return new Increment(va, id);
     };
diff --git a/src/lcm/LifeCycleActions.cc b/src/lcm/LifeCycleActions.cc
index 2b109fd04f..09d752a21c 100644
--- a/src/lcm/LifeCycleActions.cc
+++ b/src/lcm/LifeCycleActions.cc
@@ -2039,7 +2039,7 @@ void LifeCycleManager::trigger_updatevnet(int vnid)
                 // -------------------------------------------------------------
                 if ( is_tmpl || is_update )
                 {
-                    auto rc = vm->nic_update(vnid);
+                    rc = vm->nic_update(vnid);
 
                     if (rc < 0)
                     {
diff --git a/src/rm/RequestManagerVirtualMachine.cc b/src/rm/RequestManagerVirtualMachine.cc
index d98f3ecf89..0bc52d13fe 100644
--- a/src/rm/RequestManagerVirtualMachine.cc
+++ b/src/rm/RequestManagerVirtualMachine.cc
@@ -3974,8 +3974,6 @@ void VirtualMachineBackup::request_execute(
     Backups::Mode mode;
     int li_id;
 
-    ostringstream oss;
-
     // ------------------------------------------------------------------------
     // Get request parameters
     // ------------------------------------------------------------------------
diff --git a/src/scheduler/include/ScheduledActionXML.h b/src/scheduler/include/ScheduledActionXML.h
index 29abd278ac..4b4ec8d4c6 100644
--- a/src/scheduler/include/ScheduledActionXML.h
+++ b/src/scheduler/include/ScheduledActionXML.h
@@ -59,9 +59,9 @@ private:
         VMBackupAction():backup("SCHED_ACTION"){};
 
         /** ID of the VM and action**/
-        int vm_id;
+        int vm_id = -1;
 
-        int action_id;
+        int action_id = -1;
 
         /** Pending backup operation **/
         VectorAttribute backup;
diff --git a/src/scheduler/include/Scheduler.h b/src/scheduler/include/Scheduler.h
index a85e76ecfc..7e2609eae9 100644
--- a/src/scheduler/include/Scheduler.h
+++ b/src/scheduler/include/Scheduler.h
@@ -80,7 +80,9 @@ protected:
         host_dispatch_limit(0),
         zone_id(0),
         mem_ds_scale(0),
-        diff_vnets(false)
+        diff_vnets(false),
+        max_backups(5),
+        max_backups_host(2)
     {
     }
 
diff --git a/src/scheduler/include/VirtualMachinePoolXML.h b/src/scheduler/include/VirtualMachinePoolXML.h
index 86bb9fe48e..0f0f394fa6 100644
--- a/src/scheduler/include/VirtualMachinePoolXML.h
+++ b/src/scheduler/include/VirtualMachinePoolXML.h
@@ -163,12 +163,12 @@ public:
      */
     int set_up() override;
 
-    int active_backups()
+    int active_backups() const
     {
         return _active_backups;
     }
 
-    int host_backups(int host_id)
+    int host_backups(int host_id) const
     {
         return backups_host[host_id];
     }
@@ -183,7 +183,7 @@ protected:
     /**
      * Total backup operations in progress
      */
-    mutable int _active_backups;
+    mutable int _active_backups = 0;
 
     /**
      * Backup operations per host
diff --git a/src/scheduler/src/pool/VirtualMachinePoolXML.cc b/src/scheduler/src/pool/VirtualMachinePoolXML.cc
index 123858276d..916021ec54 100644
--- a/src/scheduler/src/pool/VirtualMachinePoolXML.cc
+++ b/src/scheduler/src/pool/VirtualMachinePoolXML.cc
@@ -332,7 +332,7 @@ int VirtualMachineActionsPoolXML::get_suitable_nodes(
         << " and (not(DONE > 0) or boolean(REPEAT))) or "
         << "( TIME[starts-with(text(),\"+\")] and not(DONE>0) ) ]/../..";
 
-    return get_nodes(oss.str().c_str(), content);
+    return get_nodes(oss.str(), content);
 }
 
 /* -------------------------------------------------------------------------- */
diff --git a/src/vmm/VirtualMachineManager.cc b/src/vmm/VirtualMachineManager.cc
index bfa7c32e1a..9f5957ac41 100644
--- a/src/vmm/VirtualMachineManager.cc
+++ b/src/vmm/VirtualMachineManager.cc
@@ -2374,8 +2374,6 @@ int VirtualMachineManager::updatenic(VirtualMachine * vm, int vnid)
     string   vm_tmpl;
     string   drv_msg;
 
-    ostringstream os;
-
     if (!vm->hasHistory())
     {
         return -1;