Migrating documents out of Appian to external file system

What is the easiest/most efficient way to move a large number (1 million+) of documents currently stored in Appian to an external file system? Is there a way to get the accDocs path from an Appian documentId or would it be best to create an Appian process and use the move to Filesystem smart service or do it some other way? Preferably we would like to also keep the metadata associated with the files (although we could extract that from Appian separately prior to migration if needed) I'm curious if anyone else has done this and if there any other concerns or risks we should be aware of? Thanks!

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