Start upload containing one or many chunks.
See https://www.paws-r-sdk.com/docs/backupstorage_start_object/ for full documentation.
backupstorage_start_object(BackupJobId, ObjectName, ThrowOnDuplicate = NULL)
[required] Backup job Id for the in-progress backup
[required] Name for the object.
Throw an exception if Object name is already exist.