Is it possible for a customer to download his backup via FTP?
Such feature is not implemented in Plesk yet. Take a part in our product improvement by creating a feature request on our UserVoice.
Download a backup of a domain via Plesk > Websites & Domains > Backup Manager.
Note: for big backup files, limits should be increased.
Export the backup to a file in the customer's
# /usr/local/psa/admin/bin/pmm-ras --export-dump-as-file --dump-specification=clients/example/domains/example.com/backup_info_xxxxxx.xml --dump-file-specification=/var/www/vhosts/example.com/httpdocs/backup.tar
backup_info_xxxxxx.xml - .xml file for the necessary backup.
backup_info_xxxxxx.xml can be found by navigating a cursor to a backup link in Plesk > Websites & Domains > Backup Manager
After execution above command, a customer can download the necessary backup from his