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https://docs.sophos.com/nsg/sophos-firewall/19.0/Help/en-us/webhelp/onlinehelp/index.html?contextId=ManualSynchronization

Manual synchronization

Under normal conditions, the auxiliary device is automatically synchronized with the primary device. The ability to manually synchronize peers is determined by the states of the devices in the cluster.

For example, synchronization is possible when the device in primary state goes into fault, but not when it goes into auxiliary state.

Synchronization based on device status.