Can we take backup of external table using expdp

Can we take backup of external table using expdp, please suggest any doc.
thanks in advance.

@Fahd
About the ACCESS_METHOD parameter
-It's undocumented data pump parameter and it's should be used only when requested by Oracle Support
-It's purpose is to specify the loading/unloading method, not filtering object types during the export or import
-If this parameter is not specified,the Data Pump will automatically choose the best method to load or unload the data...
so,
the External Tables method
-Is used by the data pump if data cannot be moved in the default method to load/unload data ,
and that is direct path mode, or if there is a situation where parallel SQL can be used to speed up the data move even more

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External hard drives now run less than $100 for 500GBs-1TB of storage. Very cheap backup insurance, indeed. See This Link for ExHD Examples
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Can we take backup of external table using expdp

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