The settings for Meraki devices are backed up, by default; the config resides in the Dashboard and is pushed down to the device after creation. You can get a flavour for this by looking at how you'd deploy a replacement MX unit (e.g. for RMA) here: https://documentation.meraki.com/MX/Other_Topics/MX_Cold_Swap_Replacing_an_Existing_MX_with_a_Different_MX
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