Signed documents backup

Dear all,

I am looking for a echosign backup solution. We need to have a redundant backup process for all the critical information. 

In order to do that, we need to create a copy of the signed documents in an external server.

I have checked that there is an API but it is only available for enterprise option but we are a small company and we didnt contract this part. How can we implement a backup process? The process would be:

- bulk process to grab all the current documents.

- daily process to backup new documents...

thank you in advance,