You can create an Amazon S3 instance with access and secret keys.
Procedure
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From the CommCell Browser, go to Client Computers > Amazon S3 client. 
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Right-click Cloud Apps, and then point to All Tasks > Create New Instance. The New Amazon S3 Instance dialog box appears. 
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On the General tab, provide the following details: - 
In the Instance Name box, type a name for the instance. 
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In the Access Node box, select one or more proxy client computers or the client group where the Cloud Apps package is installed. Note - 
The proxy client computers must be of similar operating system type. 
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All clients in the client group must be reachable through network routes. 
 
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In the Storage Policy box, select a storage policy for the backup and restore operations. 
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In the Number of Data Backup Streams box, type the number of data streams to use for backups. The maximum value is 99. Note: The number of streams must not exceed the maximum number configured in the subclient storage policy. The CommServe allocates streams depending on the availability of resources. 
 
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On the Connection Details tab, enter the following details: - 
In the Host URL box, type the Amazon S3 service account URL (s3.amazonaws.com). 
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From the Authentication Type list, select Access and secret keys. 
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Enter credentials: What Steps Existing credential From the Credential list, select the credential that you want to use. New credential - 
From the Credential list, click Create New. The Create user credential dialog box appears. 
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In the Credential name box, enter a name for the credential. 
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In the Access key ID box, enter the access key ID of the Amazon S3 account 
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In the Secret Access key box, enter the secret key for the Amazon S3 account. 
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Click OK. 
 
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Click OK. 
Results
The Commvault software creates a default instance and a default subclient.