diff --git a/controller/volume_controller.go b/controller/volume_controller.go
index d116faa245..15a0df7c31 100644
--- a/controller/volume_controller.go
+++ b/controller/volume_controller.go
@@ -3657,9 +3657,9 @@ func (c *VolumeController) getBackupVolumeInfo(v *longhorn.Volume) (string, stri
 		return "", "", "", errors.Wrapf(err, "failed to get backup %v for restoring volume %v", backupName, v.Name)
 	}
 
-	backupVolume, err := c.ds.GetBackupVolumeWithBackupTargetAndVolumeRO(backup.Spec.BackupTargetName, remoteBackupVolumeName)
+	backupVolume, err := c.ds.GetBackupVolumeWithBackupTargetAndVolumeRO(backup.Status.BackupTarget, remoteBackupVolumeName)
 	if err != nil {
-		return "", "", "", errors.Wrapf(err, "failed to get backup volume %v with backup target %v for restoring volume %v", remoteBackupVolumeName, backup.Spec.BackupTargetName, v.Name)
+		return "", "", "", errors.Wrapf(err, "failed to get backup volume %v with backup target %v for restoring volume %v", remoteBackupVolumeName, backup.Status.BackupTarget, v.Name)
 	}
 
 	return remoteBackupVolumeName, backupVolume.Name, backupName, nil
diff --git a/k8s/crds.yaml b/k8s/crds.yaml
index b6cc71217c..2e1609fe61 100644
--- a/k8s/crds.yaml
+++ b/k8s/crds.yaml
@@ -564,8 +564,9 @@ spec:
               ownerID:
                 type: string
               realSize:
-                description: Real size of image in bytes, which may be smaller than the size 
-                  when the file is a sparse file. Will be zero until known (e.g. while a backing image is uploading)
+                description: Real size of image in bytes, which may be smaller than
+                  the size when the file is a sparse file. Will be zero until known
+                  (e.g. while a backing image is uploading)
                 format: int64
                 type: integer
               size:
@@ -574,8 +575,9 @@ spec:
               uuid:
                 type: string
               virtualSize:
-                description: Virtual size of image in bytes, which may be larger than physical
-                  size. Will be zero until known (e.g. while a backing image is uploading)
+                description: Virtual size of image in bytes, which may be larger than
+                  physical size. Will be zero until known (e.g. while a backing image
+                  is uploading)
                 format: int64
                 type: integer
             type: object
@@ -653,8 +655,9 @@ spec:
               backing image backup
             properties:
               backingImage:
-                description: The backing image name..
-                nullable: true
+                description: |-
+                  The backing image name.
+                  Required
                 type: string
               backupTargetName:
                 description: The backup target name.
@@ -677,6 +680,7 @@ spec:
                   Required
                 type: boolean
             required:
+            - backingImage
             - userCreated
             type: object
           status:
@@ -732,7 +736,8 @@ spec:
                 description: Record the secret if this backup backing image is encrypted
                 type: string
               secretNamespace:
-                description: Record the secret namespace if this backup backing image is encrypted
+                description: Record the secret namespace if this backup backing image
+                  is encrypted
                 type: string
               size:
                 description: The backing image size.
@@ -878,6 +883,7 @@ spec:
                 - full
                 - incremental
                 - ""
+                type: string
               backupTargetName:
                 description: The backup target name.
                 nullable: true
@@ -1119,9 +1125,6 @@ spec:
                 description: The interval that the cluster needs to run sync with
                   the backup target.
                 type: string
-              readOnly:
-                description: ReadOnly indicates if it can create a backup on the remote backup target or not.
-                type: boolean
               syncRequestedAt:
                 description: The time to request run sync the remote backup target.
                 format: date-time
@@ -4214,7 +4217,8 @@ spec:
                 - gzip
                 type: string
               backupTargetName:
-                description: 'The backup target name that the volume will be backed up to or is synced.'
+                description: The backup target name that the volume will be backed
+                  up to or is synced.
                 type: string
               dataEngine:
                 enum: