Update 'Backing up stuff in Google Cloud Storage'

Backing-up-stuff-in-Google-Cloud-Storage.md

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+Once you have a subscription, these are the steps:
+
+1. Create a bucket in Google Cloud Storage  
+2. Create a service account in IAM & Admin of the subscription
+3. When creating the account, there's an option to add a role. This role has to be "Storage object creator". If that has ever to be edited, it has to be edited in the initial IAM page, together with the other principals.
+4. Create a json file for the key of that service account, in the specific menu for service accounts, where the account was created.
+5. Install the google cloud SDK
+6. Authenticate the google cloud command with the service principal (`gcloud auth activate-service-account --key-file=[KEY_FILE]
+`)
+7. Use the gcloud command to copy the local file to the bucket