Explain the concept of backup retention and why it's important.

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Backup retention refers to how long backup copies are kept before being deleted or overwritten. It's crucial for:

Compliance Requirements: Many industries require data retention for specific periods (7 years for financial records)
Point-in-Time Recovery: Ability to restore data from different time periods
Storage Cost Management: Longer retention = higher storage costs
Legal Protection: Historical data may be needed for litigation
Common Retention Strategies:
Daily backups kept for 30 days
Weekly backups kept for 12 weeks
Monthly backups kept for 12 months
Yearly backups kept for 7 years

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