Process for backing up plug-ins and rolling back in case of issues

Hi all,

What's the correct process for backing up plug-ins and then reverting back to this version after an upgrade if necessary?

I've tried selecting the plug-ins, clicking "Download Selected" to get the zip folder, and then importing this ZIP folder but this is giving me the following message:

The specified file does not contain a valid package and cannot be imported. (APNX-1-4154-000)

Thanks

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