combine check

Author: Pearl1594

server/src/main/java/org/apache/cloudstack/backup/BackupManagerImpl.java

@@ -358,9 +358,7 @@ public BackupOffering cloneBackupOffering(final CloneBackupOfferingCmd cmd) {
             if (!provider.isValidProviderOffering(sourceOffering.getZoneId(), externalId)) {
                 throw new CloudRuntimeException("Backup offering '" + externalId + "' does not exist on provider " + provider.getName() + " on zone " + sourceOffering.getZoneId());
             }
-        }
 
-        if (!Objects.equals(sourceOffering.getExternalId(), externalId)) {
             final BackupOffering existingOffering = backupOfferingDao.findByExternalId(externalId, sourceOffering.getZoneId());
             if (existingOffering != null) {
                 throw new CloudRuntimeException("A backup offering with external ID '" + externalId + "' already exists in this zone");