Allow parallel execution of NAS backup and delete commands

core/src/main/java/org/apache/cloudstack/backup/TakeBackupCommand.java

@@ -89,6 +89,12 @@ public void setVolumePaths(List<String> volumePaths) {
 
     @Override
     public boolean executeInSequence() {
-        return true;
+        // Returning false lets the KVM agent dispatch this command in parallel with
+        // other backup commands (notably DeleteBackupCommand). A long-running snapshot
+        // copy must not block a concurrent delete on a different VM's backup. Safe
+        // because each backup operates on its own on-NAS path (named after the VM
+        // uuid + timestamp) and the NFS mount lifecycle is per-script-invocation,
+        // not shared — so there is no path-level contention between parallel runs.
+        return false;
     }
 }