Unable to configure FTP storage in Plesk > Tools & Settings > Backup Manager > FTP Storage Settings due to the following error:
PLESK_ERROR: Error: Unable to access to the storage: Transport error: unable to list directory: Curl error: (7) Couldn't connect to server: Last FTP request: Last FTP response: Make sure you have entered the correct storage settings. You can check them independently with the command: curl -v -P - -u vps1host 'ftp://203.0.113.2//public_html//'
Direct FTP access to the affected storage is possible.
There are two VPS instances with the same IP and hostname.
Change IP and hostname on one of the instances.