http://azure.microsoft.com/zh-tw/documentation/articles/backup-azure-backup-cloud-as-tape/
Use Azure Backup to replace your tape infrastructure
Azure Backup and System Center Data Protection Manager customers can:
- Backup data in schedules which best suit their organization needs
- Retain the backup data for longer durations
- Make Azure a part of their long term retention needs (instead of tapes).
This article explains how customers can enable backup and retention policies. Customers who use tapes to address their long-term-retention needs now have a powerful and viable alternative with the availability of this feature. The feature is enabled in the latest release of the Azure Backup (which is available here). SCDPM customers would need to move to UR5 before using this feature.
What is the Backup Schedule?
Backup schedule indicates the frequency (or how-often) of the backup operation e.g. the settings in the screen below indicates that backups will be taken daily at 6pm and at midnight.
Customers can also schedule a weekly backup e.g. the settings in the screen below indicates that backups will be taken every alternate Sunday & Wednesday at 9.30am and 1am.
What is Retention Policy?
Retention policy specifies the duration for which the backup must be stored. Rather than just specifying a “flat policy” for all backup points, customers can specify different retention policies based on when the backup is taken. For e.g., the backup point taken at the end of each quarter may need to be preserved for a longer duration for audit purposes while the backup point taken daily (which serves as an operational recovery point) needs to be preserved for 90 days.
The total number of “retention points” specified in this policy is 90 (daily points) + 40 (one each quarter for 10 years) = 130.
Example – Putting both together
- Daily retention policy: Backups taken daily are stored for 7 days.
- Weekly retention policy: Backups taken every at midnight and 6pm Saturday will be preserved for 4 weeks
- Monthly retention policy: Backups taken at midnight and 6pm on the last Saturday of each month will be preserved for 12months
- Yearly retention policy: Backups taken at midnight on the last Saturday of every March will be preserved for 10 years
The total number of “retention points” (points from which a customer can restore data) in the above diagram is computed as follows:
- 2 points per day for 7 days = 14 recovery points
- 2 points per week for 4 weeks = 8 recovery points
- 2 points per month for 12 months = 24 recovery points
- 1 point per year per 10 years = 10 recovery points
The total number of recovery points is 56.
Advanced configuration
By clicking on Modify in the above screen, customers have further flexibility in specifying retention schedules.
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