From what I've seen and used, appliances are released with the ability to restore their default VM, probably from a ghost partition of some kind (I'm thinking about Comrex radio STL units I've worked with). Patches can be applied to the appliance, with the latest patch usually containing all the previous patches (if needed).
A new VM means a new appliance - Comrex ACCESS 2.0 or whatever, and 1.0 patches don't work on it. It's never backed up, rather it can just be restored to a factory state. The Comrex units store connection settings, static IP configuration, all that junk, but resetting kills all that and has to be re-entered (which I've had to do before).
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根据我所看到和使用的情况，发布的设备能够恢复其默认虚拟机，可能是从某种幽灵分区（我正在考虑我使用过的 Comrex 无线电 STL 单元）。可以将补丁应用到设备，最新补丁通常包含所有以前的补丁（如果需要）。
新的虚拟机意味着新的设备 - Comrex ACCESS 2.0 或其他，1.0 补丁对其不起作用。它永远不会备份，而只能恢复到出厂状态。 Comrex 单元存储连接设置、静态 IP 配置和所有这些垃圾，但重置会杀死所有这些，并且必须重新输入（我以前必须这样做）。
From what I've seen and used, appliances are released with the ability to restore their default VM, probably from a ghost partition of some kind (I'm thinking about Comrex radio STL units I've worked with). Patches can be applied to the appliance, with the latest patch usually containing all the previous patches (if needed).
A new VM means a new appliance - Comrex ACCESS 2.0 or whatever, and 1.0 patches don't work on it. It's never backed up, rather it can just be restored to a factory state. The Comrex units store connection settings, static IP configuration, all that junk, but resetting kills all that and has to be re-entered (which I've had to do before).