Symptoms

Manual Backup fails with the error:

Structure com.vmware.appliance.recovery.backup.job.details.info has a union with a field not required for this case = end_time

/var/log/vmware/applmgmt/backup.log

2021-06-12T07:07:01.521 [MainProcess:PID-31393] ERROR: BackupManager encountered an exception: Failed to create FTP dir 'ftp://diskstation:21/vmwarebackup/vCenter/sn_vcsa.corp.local/M_6.7.0.40000_20210612-070507_IJQWG23VOAQHA4TJN5ZCA5DPEB2XAZDBORSSAM3OEBQXA4DMNFSWI===/' at 'ftp://diskstation:21/vmwarebackup/vCenter/sn_vcsa.corp.local/M_6.7.0.40000_20210612-070507_IJQWG23VOAQHA4TJN5ZCA5DPEB2XAZDBORSSAM3OEBQXA4DMNFSWI===/'; ret=9
 
2021-06-12T07:07:02.207 [MainProcess:PID-31393] WARNING: Ignore to clean up failed backup files, due to issue: 'Failed to list FTP dir with cmd ['/usr/bin/curl', '--fail', '-u', 'svc-vmwarebackup:', '--connect-timeout', '10', '--ssl-reqd', '-k', '--noproxy', '', '--silent', '--show-error', '--list-only', 'ftp://diskstation:21/vmwarebackup/vCenter/sn_vcsa.corp.local/M_6.7.0.40000_20210612-070507_IJQWG23VOAQHA4TJN5ZCA5DPEB2XAZDBORSSAM3OEBQXA4DMNFSWI===/']; ret=9 

Solution

• Check that the target directory is empty and
• Check the casing of the path. Depending on what you are backup to, it might be case sensitive. At least it was for me backing up to a Synology NAS over ftps.