This is a known issue 

It is an issue with OADP 1.1.2 which is used by ACM backup; so not a bug with the ACM backup but affecting ACM backup and restore

related to 

https://issues.redhat.com/browse/OADP-1511

Title for known issue :

OADP 1.1.2  BackupSchedule gets into a FailedValidation status when using OADP 1.1.2 or above

Content:

Problem description:

You enable the backup and restore ACM component and successfully create a DataProtectionApplication resource, which creates a BackupStorageLocation resource with a status of Available

You create a BackupSchedule resource and the status goes into FailedValidation, with the following message: 
oc get backupschedule -n open-cluster-management-backup
NAME PHASE MESSAGE
rosa-backup-schedule FailedValidation Backup storage location is not available. Check velero.io.BackupStorageLocation and validate storage credentials.

Issue: 

The BackupStorageLocation resource has no ownerReference. It should be the DataProtectionApplication resource as the ownerReference

Workaround:

To workaround the problem, manually add this ownerReference to the BackupStorageLocation:

1. Edit replicas from 1 to 0 in OADP operator CSV 

oc edit csv -n open-cluster-management-backup 

oadp-operator.v1.1.2

1.  Patch ownerReference annotations on the BSL as below
2. Turn back the oadp-operator.v1.1.2 replica to 1 for normal processing of dpa

metadata:
resourceVersion: '273482'
name: dpa-sample-1
uid: 4701599a-cdf5-48ac-9264-695a95b935a0
namespace: open-cluster-management-backup
ownerReferences: <<

• apiVersion: oadp.openshift.io/v1alpha1
  blockOwnerDeletion: true
  controller: true
  kind: DataProtectionApplication
  name: dpa-sample
  uid: 52acd151-52fd-440a-a846-95a0d7368ff7