数据检索

Data retrieval is the process of receiving temporary access to archived data, so that it can be restored.

The process of retrieving data from the archive tier takes course in a separate retrieval job session. It is completed when a restore point is available for reading and restore. For information on how to launch the retrieval job, see Retrieving Backup Files.

When the retrieval job is complete, the retrieved data will be available for a certain period of time, during which you can restore it to the capacity tier. However, you can extend the availability period.

Retrieval cost varies depending on the desired speed of the process and on the targeted period of the data accessibility. See below the options for different vendors.

Retrieval Options for Amazon S3 Glacier

Amazon provides the following options for data retrieval. The indicated time is approximate. For more information, see this Amazon article.

• Expedited: the most expensive method. Retrieval takes 1-5 minutes.

Keep in mind that this option will be unavailable for data stored in Glacier Deep Archive class.

A backup file can be stored in Glacier Deep Archive if the following conditions are met:

1. The Use Glacier Deep Archive for backups with the retention policy over 180 days check box was selected on the Specify Object Storage Settings step of the Adding Amazon S3 Glacier wizard.
2. The backup file retention period is 180 days or more.
3. If the Store archived backups as standalone fulls check box was not selected on the Add Archive Tier step of the New Scale-Out Backup Repository wizard, that is, the reuse of the data blocks was allowed, all the backup files in the chain after the one stored in Deep Archive will be automatically considered as belonging to Deep Archive as well.

• Standard: retrieval time 3-5 hours for Amazon S3 Glacier and within 12 hours for Amazon S3 Glacier Deep Archive.
• Bulk: the least expensive method. Retrieval time within 5-12 hours for Amazon S3 Glacier and within 48 hours for Amazon S3 Glacier Deep Archive.

Expiration of the Retrieved Data for Amazon S3 Glacier

Estimated time of data expiration is calculated from the moment of the data retrieval launch. Required number of days is added to that moment.

However, during the retrieval job Veeam Backup & Replication constantly requests the S3 API to move the expiration time forward, until the job is completed and all the data blocks are ready.

For more information on calculating the estimated expiration time, see this Amazon article.

For information on how to extend the expiration time, see Extending Expiration Time.

Retrieval Options for Azure Archive Storage

Azure provides the following options for data retrieval. The indicated time is approximate. For more information, see this Microsoft article.

• High Priority: most expensive method. Retrieval may take less than one hour.
• Standard Priority: least expensive method. Retrieval takes up to 15 hours.

Expiration of the Retrieved Data for Azure Archive Storage

Unlike Amazon S3 Glacier, Azure API does not temporarily change the storage class of a backup file from Archive Tier to Hot. Instead, a temporary copy of a backup file is created in Hot storage class. Since the deletion of this temporary copy is managed by Veeam Backup & Replication, the expiration time is quite accurate (within ten minutes, which is the frequency of the deletion process).

For information on how to extend the expiration time, see Extending Expiration Time.

Related Topics

• Retrieving Backup Files
• Extending Expiration Time