Backup strategy and backup policy¶
In conversation, ‘backup strategy,’ ‘backup policy,’ and ‘backup plan’ are used interchangeably, but the terms have distinct meanings.
A backup strategy is an overall approach or methodology for backing up the data in a database system. The strategy includes the decisions and considerations for what data to back up, how frequently backups should be taken, what backup methods and technologies to use, where to store the backup files, and what steps should be taken to ensure data integrity and the ability to recover.
A backup strategy typically involves business requirements, the Recovery Point Objective (RPO), the maximum acceptable data loss in case of system failure or disaster, and the Recovery Time Objective (RTO), the acceptable downtime for restoring the system after a failure, and compliance regulations.
A backup policy defines the guidelines, rules, or standards for specific procedures and practices for implementing the backup strategy.
The policy outlines the following:
-
Detailed steps and parameters for performing backups
-
Retention periods
-
Backup types
-
Backup verification methods
-
Error handling procedures
-
Security measures
A backup plan, based on the backup strategy and the backup policy, is a detailed operation document that specifies how to execute the backup strategy in actionable steps and defines the timelines for backup activities.
A backup plan can include the following details:
-
Who performs the backup
-
When backups are scheduled
-
How backups are monitored and audited
-
What actions to take in case of backup failures or emergencies
Types of backup¶
A full backup copies all data to a storage location. This type of backup creates a complete copy of the data set. The benefit of a full backup is a quick recovery since the data is stored in one place. However, this type of backup is also the most time-consuming and storage-intensive; it duplicates all data regardless of whether it has changed since the last backup.
An incremental backup only copies data that has changed since the last backup, whether that was a full or another incremental backup. This method is faster and more storage-efficient than a full backup. However, the recovery can be slower because you must restore each set of changes in sequence.
For more information, see the example of using a full backup with incremental backups.
Backup policy defined¶
The backup policy sets the guidelines and objectives for data protection, while the backup strategy provides the roadmap for achieving those objectives.
A backup policy may state that all customer data must be backed up daily, with a full backup at the start of each week and incremental backups taken each business day. These definitions are based on the following: It also defines how long backups should be retained based on legal or regulatory requirements.
The difference between a backup policy and a backup strategy lies in their scope and detail. A backup policy is more about the following:
-
‘what’ — What should be backed up and may include information on compliance and governance
-
‘when’ - When should you do backups
The backup strategy contains the ‘how’ — how the backups are scheduled and includes information on the backup technologies and the restoration process.
The backup strategy details the use of specific backup software, the configuration of backup schedules, the process for monitoring backup success, and the necessary steps for restoring data.
Backup policy best practices¶
An effective backup policy is crucial for safeguarding an organization’s data integrity and availability. Here are some best practices to consider:
Backup Policy Best Practices | Markdown Table
| Best Practice | Description |
|---|---|
| Regularly Update and Review | Ensure the backup policy is a living document, updated to reflect changes in technology, business processes, and regulations. |
| Clearly Define Roles and Responsibilities | Assign specific individuals or teams for executing backups, monitoring success, and managing restoration. |
| Adopt the 3-2-1 Backup Rule | Have 3 data copies, store them on 2 different media types, and keep 1 copy offsite. |
| Ensure Comprehensive Coverage | The policy should cover all critical data, applications, and systems to avoid data loss gaps. |
| Encrypt Backup Data | Protect backups with encryption, especially for offsite or cloud storage. |
| Test Backups Regularly | Regularly test backup processes to ensure data can be effectively restored. |
| Implement a Disaster Recovery Plan | Integrate the backup policy with a broader disaster recovery plan for data loss scenarios. |
| Use Reliable Backup Software and Hardware | Invest in proven technologies with robust backup and restoration capabilities. |
| Monitor Backup Procedures | Continuously monitor procedures to ensure they function as intended and identify issues promptly. |
| Train Staff | Educate relevant staff on the importance of backups and their role in the process. |
| Document the Backup Process | Maintain thorough documentation of the backup process, including schedules, technologies, and restoration procedures. |
| Define Service Level Agreements (SLAs) | Establish clear SLAs for backup and recovery times to set expectations and ensure accountability. |
| Comply with Legal and Regulatory Requirements | Ensure the policy complies with relevant laws and regulations regarding data retention and protection. |
| Plan for Scalability | Design the policy to accommodate future data volume growth and infrastructure changes. |
| Conduct Periodic Risk Assessments | Regularly assess data risks and adjust the backup policy to mitigate those risks. |
By adhering to these best practices, organizations can create a robust backup policy that protects their data and supports their business continuity and disaster recovery strategies. It’s important to remember that the effectiveness of a backup policy is not just in its creation but in its implementation and ongoing management. Regular reviews, updates, and staff training ensure the backup policy remains relevant and effective in evolving data landscapes and threats. The goal is to have a backup policy that is not only comprehensive and compliant but also practical and responsive to the organization’s needs.
Backup policy example¶
An example of a backup policy might include the following components:
| Aspect | Details |
|---|---|
| Purpose | To define the procedures and responsibilities for backing up organizational data to ensure its availability in case of data loss. |
| Scope | This policy applies to all data, hardware, and software in the organization’s information systems. |
| Policy Statement | The organization shall maintain a regular backup schedule for all critical data. Full backups are to be performed weekly, with incremental backups occurring daily. All backups must be encrypted and stored in a secure, off-site location. |
| Roles and Responsibilities | The IT department is responsible for executing backups as scheduled. The department head will ensure that backup procedures are followed and reviewed regularly. |
| Backup Procedures | The IT department must use software and hardware. Data to be backed up includes, but is not limited to, customer information, financial records, and operational data. |
| Data Retention | Retain the backup data for five years or as required by law or industry regulations. |
| Disaster Recovery | In the event of data loss, the IT department shall follow the disaster recovery plan to restore data from the most recent backup. |
| Review and Testing | Review the backup policy and procedures annually. Test the backup and restoration procedures quarterly to ensure they are effective. |
Test the backups¶
You must test the effectiveness of your backups and demonstrate that you can recover your data in the event of loss or corruption.
Here are several methods to assess the reliability of your backup system:
| Aspect | Details |
|---|---|
| Perform Regular Test Restores | The most reliable way to test backups is to periodically restore the data to a separate system. This restoration verifies the backup’s integrity and the restoration process’s functionality. |
| Monitor Backup Reports | Regularly review backup reports and logs for any errors or failures during the backup process. This can help identify issues early before they become critical problems. |
| Check for Data Consistency | Compare the original data with the backed-up data to ensure consistency. This can be done by checking file sizes, using checksums, or employing other data validation techniques. One tool would be to use [pt-table-checksum]. |
| Simulate Disaster Scenarios | Conducting a simulated disaster recovery exercise can help determine how well your backup system will perform under stress and identify any gaps in your recovery plan. |
| Audit Backup Procedures | Regular audits of the backup procedures can ensure that the backups are being performed in accordance with the established policies and that the backup system is functioning as expected. |
| Validate Backup Configuration | Ensure that the backup configuration is correct and that all necessary data is being backed up. This includes checking backup schedules, retention policies, and the scope of the data backed up. |
| Verify Security Measures | Confirm that the backup data is secure and that encryption and other security measures are functioning correctly to protect against unauthorized access. |
| Evaluate Recovery Time Objectives | Measure how long it takes to restore data from backups and compare this with your recovery time objectives to ensure they align with your business requirements. |
| Assess Backup Media Reliability | Regularly check the physical and logical condition of the backup media, whether it’s tape, disk, or cloud storage, to ensure it’s in good working order. |
| Conduct Incremental Backup Tests | Test the restoration of incremental backups to ensure that they work in conjunction with full backups and that the data can be restored to a specific point in time. |
| Review Backup Software Updates | Keep the backup software updated and test after updates to ensure new versions or patches do not introduce issues with the backup or restoration processes. |
| Check for Compatibility Issues | Ensure that the backup system is compatible with all the software and data formats used in your organization to avoid restoration issues. |
| Document Test Results | Keep detailed records of all backup tests, including the scope, date, issues encountered, and resolutions. This documentation can be invaluable for troubleshooting and improving the backup process. |
By implementing these methods, you are confident that your backup system protects your data and can recover your data when necessary. Regular testing and monitoring are key to maintaining an effective backup strategy and ensuring business continuity. Remember, the goal of testing is not just to prove that backups can be restored, but to identify and resolve any issues before an actual disaster occurs. This proactive approach can save valuable time and resources, and ultimately, safeguard your organization’s data integrity.
Common challenges¶
Common backup challenges often include issues such as damaged backups, missing or failed backups, maintaining legacy systems, adhering to strict privacy and security regulations, and managing the costs associated with data backup. To overcome these challenges, organizations can adopt several strategies. Implementing a modern, reliable backup solution that includes automated data consistency checking can help protect against damaged backups. Regular recovery tests can ensure that data is recoverable and not corrupt.
For missing or failed backups, it’s essential to have a robust monitoring system that alerts IT staff to any issues with the backup process. This allows for immediate action to rectify any problems before they escalate. Maintaining legacy systems can be addressed by gradually phasing out older technology and replacing it with more current, supported solutions. This can help avoid the pitfalls of outdated systems that may not be compatible with newer technologies or that may no longer be supported by the vendor.
Adhering to privacy and security regulations requires a thorough understanding of the laws and standards that apply to an organization’s industry and geography. Implementing encryption and access controls can help ensure that backups are secure and compliant with regulations. Finally, managing the costs of data backup involves careful planning and budgeting. Organizations should consider the total cost of ownership of their backup solutions, including initial investment, ongoing maintenance, and potential costs associated with data recovery.
In addition to these strategies, it’s essential to follow best practices such as the 3-2-1 backup rule, which suggests having three copies of data on two different media, with one copy stored offsite. Regular testing and validation of backups, clear documentation of backup procedures, and continuous training for staff involved in the backup process are also crucial for overcoming common backup challenges. By staying vigilant and proactive, organizations can ensure that their data remains secure and recoverable, even in these challenges.
Disaster recovery plan¶
A disaster recovery plan (DRP) is a structured approach with detailed instructions for responding to unplanned incidents such as natural disasters, power outages, cyber-attacks, and other disruptive events.
This table organizes the different sections of the disaster recovery plan, along with brief descriptions of each section.
| Section | Description |
|---|---|
| Introduction | This section outlines the purpose of the plan, its scope, and the types of disasters it covers. It also includes the plan’s objectives, such as minimizing downtime and data loss. |
| Roles and Responsibilities | This part defines the disaster recovery team’s specific roles. It lists the contact information for each team member and outlines the chain of command. |
| Incident Response | This section provides the steps to detect, report, and assess damage caused by a disaster. It includes procedures for immediate response to limit the impact on operations. |
| Plan Activation | Here, the criteria for launching the disaster recovery plan are detailed. It specifies who has the authority to activate the plan and under what circumstances. |
| Communication Plan | This part details how communication should be handled during a disaster, including internal communication with employees and external communication with customers, suppliers, and the media. |
| Recovery Strategies | This section outlines the strategies for restoring hardware, software, and data that are critical to resuming business operations. It includes prioritized actions for recovery and the resources required. |
| Data Backup Procedures | Detailed instructions for restoring data from backups are provided here. It includes the locations of backups, the types of backups (full, incremental), and the backup schedule. |
| Site Relocation | If the primary business location is compromised, this part of the plan details the process for moving operations to an alternate site. |
| Plan Testing and Maintenance | This section describes the schedule for regular testing of the DRP to ensure its effectiveness. It also outlines the process for updating the plan as the business and technology environment changes. |
| Appendices | The appendices may include site maps, network diagrams, floor plans, and any other documentation that supports disaster recovery efforts. |
It’s important to note that a DRP should be tailored to the specific needs of the organization and should be reviewed and tested regularly to ensure it remains effective and up-to-date. The example provided here is a high-level overview and would need to be expanded with detailed, actionable steps specific to the organization’s operational requirements. For more detailed templates and guidance on creating a disaster recovery plan, there are resources available online that can provide a starting point for developing a comprehensive plan.
Get expert help¶
If you need assistance, visit the community forum for comprehensive and free database knowledge, or contact our Percona Database Experts for professional support and services.