In an on-premises environment, to store your backups in Amazon S3, you need a user account. Then, to the user account, you need to assign a policy that has the permissions that are required for Commvault Cloud to access the storage.
Procedure
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Create an AWS user account, and generate an access key and a secret key for the account.
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Assign the policy that meets your business requirements:
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For least privilege access, assign a custom policy using the Amazon_S3.json file.
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Otherwise, assign the AmazonS3FullAccess policy.
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Related Topics
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Creating an IAM user in your AWS account in the AWS documentation