Creating backups for sharded clusters was included in PMM 2.38 and is available straight from the UI. However, restoring these backup artifacts is only possible via the CLI, using Percona Backup for MongoDB. For information on restoring sharded backups, check the PBM documentation.
Retention policy is supported only for snapshot types of scheduled backups and for the S3-compatible storage type.
Before restoring, make sure to prevent clients from accessing the database.