feat: Add install arg and config for concurrent backups

Co-authored-by: aider (gemini/gemini-2.5-pro) <aider@aider.chat>
Signed-off-by: Scott Seago <sseago@redhat.com>

pkg/install/deployment.go

@@ -59,6 +59,7 @@ type podTemplateConfig struct {
 	repoMaintenanceJobConfigMap     string
 	nodeAgentConfigMap              string
 	itemBlockWorkerCount            int
+	concurrentBackups               int
 	forWindows                      bool
 	kubeletRootDir                  string
 	nodeAgentDisableHostPath        bool
@@ -224,6 +225,12 @@ func WithItemBlockWorkerCount(itemBlockWorkerCount int) podTemplateOption {
 	}
 }
 
+func WithConcurrentBackups(concurrentBackups int) podTemplateOption {
+	return func(c *podTemplateConfig) {
+		c.concurrentBackups = concurrentBackups
+	}
+}
+
 func WithPriorityClassName(priorityClassName string) podTemplateOption {
 	return func(c *podTemplateConfig) {
 		c.priorityClassName = priorityClassName
@@ -337,6 +344,10 @@ func Deployment(namespace string, opts ...podTemplateOption) *appsv1api.Deployme
 		args = append(args, fmt.Sprintf("--item-block-worker-count=%d", c.itemBlockWorkerCount))
 	}
 
+	if c.concurrentBackups > 0 {
+		args = append(args, fmt.Sprintf("--concurrent-backups=%d", c.concurrentBackups))
+	}
+
 	deployment := &appsv1api.Deployment{
 		ObjectMeta: objectMeta(namespace, "velero"),
 		TypeMeta: metav1.TypeMeta{

pkg/install/resources.go

@@ -271,6 +271,7 @@ type VeleroOptions struct {
 	RepoMaintenanceJobConfigMap     string
 	NodeAgentConfigMap              string
 	ItemBlockWorkerCount            int
+	ConcurrentBackups               int
 	KubeletRootDir                  string
 	NodeAgentDisableHostPath        bool
 	ServerPriorityClassName         string
@@ -362,6 +363,7 @@ func AllResources(o *VeleroOptions) *unstructured.UnstructuredList {
 		WithPodResources(o.PodResources),
 		WithKeepLatestMaintenanceJobs(o.KeepLatestMaintenanceJobs),
 		WithItemBlockWorkerCount(o.ItemBlockWorkerCount),
+		WithConcurrentBackups(o.ConcurrentBackups),
 	}
 
 	if o.ServerPriorityClassName != "" {