It collects WiFi Radio Analytics (2.4GHz / 5GHz-Low / 5GHz-High frequency utilisation), Activity History (data usage by device, as well as "scan" and ad blocks by device).

For ad blocking and network control, it also has "Block & Allow Sites" with the blacklisted and whitelisted domain names, which you may have to use to block ads and also unblock some domains that stop working as a result of bogus entries in the ad block.

All of this information is stored in the cloud, but I found no way to export it in any way. I've actually contacted eero, asking for the export, and they've basically admitted that it's not supported.