get Backup Storage
Retrieves the CloudStorageAdapter associated with the specified backup method.
This function looks up the provided method in the backupOptions
map. If a corresponding CloudStorageAdapter is found, it is returned. Otherwise, null is returned.
Return
The CloudStorageAdapter associated with the specified method, or null if no adapter is found.
Parameters
method
The BackupMethods representing the desired backup method (e.g., GOOGLE_DRIVE, DROPBOX).