Best Practices for Restarting / Updating a Sophos UTM 9 Environment

Question

Hello everybody, 
 
 I have several sophos devices (ASG Software, SG125, SG210,SG115), which administers red sophos and access points. 
 I would like to update these UTMs and I would like to have some information on the procedure to follow. HA is being implemented. 
 
 Is there a risk that the configuration will be lost? Of course I will backup the configuration beforehand. 
 Can we go back in time if something goes wrong? 
 Does the UTM update push the update of other devices (Sophos RED and AP)? 
 What are the precautions? 
 
 Thank you for your answers.

Vivek Jagad · Answer

Hello Aiche Sofiane ,

Thank you for reaching out to the community, you can refer the useful KBAs below:

And yes via pattern updates, the push the update of other devices (Sophos RED and AP)

1.) Sophos UTM: Set up High Availability in Hot-Standby (Active-Passive) or Cluster (Active-Active) mode
2.) Sophos UTM: The High Availability concept
3.) Sophos UTM: High Availability and Clustering status information
4.) The Up2date process for HA and Cluster systems in Astaro Security Gateway
5.) Sophos UTM: High Availability CLI Tools
6.) Perform a Sophos UTM Up2Date from the command line
7.) Sophos UTM: Disaster Recovery