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Remember SQL backup. Backend or the agent? If your backend is in HA, then just one-by-one upgrade. Are you using any provisioning method, MCS or PVS?

Backend, and no HA hehe

Oh damn. Servicewindow and upgrade. If it's mandatory to session log

Thanks, we're using an internal provisioning service

Alright. Then you're good 🙂 happy hunting

thanks!