> For the complete documentation index, see [llms.txt](https://mariadb.com/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://mariadb.com/docs/gridgain/gridgain-9/gridgain9-management/backup-and-replication/disaster-recovery.md).

# Disaster Recovery

Recovering a GridGain 9 cluster after data loss or failure of system groups.

Disaster recovery covers the procedures for restoring a GridGain 9 cluster to a working state after partition data loss or the failure of critical system groups. These are operational tasks you run when normal fault tolerance has been exceeded — for the concepts behind fault tolerance, see [Cluster Fault Tolerance](/docs/gridgain/gridgain-9/architecture/cluster/cluster-fault-tolerance.md).

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[Data Recovery](/docs/gridgain/gridgain-9/gridgain9-management/backup-and-replication/disaster-recovery/data-recovery.md)
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Disaster recovery operations for GridGain 9 data partitions — minority and majority offline scenarios, partition loss, and partition states.
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[System Groups Recovery](/docs/gridgain/gridgain-9/gridgain9-management/backup-and-replication/disaster-recovery/system-groups-recovery.md)
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Disaster recovery operations for GridGain 9 system RAFT groups — recovering the Cluster Management Group and the Metastorage Group after permanent majority loss.
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