Create v2 Backup problem

Error message: [“[10.07.2023_09-14-57:INFO] Checking if backup modules installed,0”,“[10.07.2023_09-14-57:INFO] Creating backup config,0”,“[10.07.2023_09-14-57:FAILED] Failed during config generation, Error: [Errno 13] Permission denied: ‘/home/backup/sitename/config.json’[404]”]

why it’s error

and i have another question
what is Operation Failed! ‘backupRetention’ in Manage Existing Backup Schedules i select Frequency (Daily) to never , daily or weekly