How we decreased GitLab repo backup times from 48 hours to 41 minutes

Repository backups are essential for disaster recovery, but as repositories grow, backup creation becomes challenging due to time constraints and resource demands. GitLab faced this issue with a Rails repository taking 48 hours to back up, traced to a Git function with O(N²) complexity. By implementing an algorithmic improvement using a map data structure, GitLab reduced the backup time to just 41 minutes, enhancing scalability and efficiency. This change not only lowers costs and risks but also allows for comprehensive and frequent backup strategies without compromising system performance. The fix, contributed upstream to Git, benefits all Git users, providing GitLab customers with immediate advantages in disaster recovery planning, including reduced recovery point objectives and operational overhead. This improvement, part of GitLab's commitment to scalable infrastructure, highlights the importance of collaborative development in enhancing performance across the Git community.

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