We have configured a FAS8020 cluster running ontap 9.1P9 to upload configuration backup to a remote FTP server, using a system account on such server to access and create files.
Backups are successfully saved, however they are not removed from the FTP server when they should be, according to the configured retention policy. Furthermore, the filer command "system configuration backup show" correctly lists only the latest backup according to the retention policy.
It looks like the filer can create backup files on the FTP server but it is not able to delete them when they expire. I cannot find errors in any of the logs on both the filer and the server. Is it by design? Do I need to set up a cleanup script on the server, despite the filer having full read/write permissions on the FTP area?