How to upgrade more safely and smoothly, with the option to roll back?

OpenWrt is the primary router for our company. How can we upgrade it safely and smoothly, for example from version 21 to version 22? After the upgrade, the existing services will not be affected too much. Also, in case something happen, I can roll back.

Some of that depends on how you have it set up now. What kind of router. What storage space you have, if you use extroot, etc. Can you give more details on the device?

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