Google Cloud Setup

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Step 1: Create a Google Cloud Project
Step 2:  Go to IAM & Admin -> IAM
Step 3: Find service account, and press "Edit member" (pen button) on the right side of it
Step 4: Press "Add condition"
Step 5: Open "Condition Editor" and put the expression, filling the bucket name
(resource.type != "storage.googleapis.com/Bucket" && resource.type != "storage.googleapis.com/Object") || resource.name.startsWith("projects/_/buckets/<name>/") || resource.name == "projects/_/buckets/<name>"
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Step 6: Press Save in both condition editor and permissions editor. Otherwise it will be canceled
Step 7: Go To Class 4 and Open the Archive Setting page
Step 8: Select Server Name
Class 4 platform select using multiple sip switch server.  Each sip switch server has its own directory for storing backup data. 
Step 9: Select where you want to store the data
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Here is a video showing you how can obtain the Google Cloud Service Key json file:
​https://drive.google.com/file/d/1Loon-8jWRZdDiUg0251sODHswqIBIeyf/view?usp=sharing​