Thank you for the additional detail, that is very helpful. What I gather is you are attempting to archive the statistical data for clients for a period of 1 year. This likely includes the detail data for the client in terms of what resources they were accessing. This is a good question, I don't know if I have a solution off the top of my head. I am betting this will end up being something that can be solved using the API. I know that Cisco Meraki is investing in the developer community and the API.
I'd stay away from splunk. If you're looking to archive event data and take advantage of big data, data correlation and data warehousing with a true cloud solution (like Meraki) have a look at https://www.sumologic.com/.
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