The capture profile stops at 100mb for one file then another starts (based on the profile criteria) until it also reaches 100mb. In Wireshark you can merge multiple captures together. I'm not sure how many individual files can be saved but each file is uploaded to the manager upon creation.
It is possible you may lose a packet or two or there may be some overlap but capturing that much data for purposes of packet analysis you won't likely notice it. If you are looking to collect malware or other files from the traffic you would do better to set up a Linux server with TCP dump on a span port or if you have MWG you can use that too.
I'd be interested in knowing how you decide to solve this so please respond when you are able.
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