Sachaniman

I'm trying to convince a party to use Signal to communicate privately with me, and would like to verify certain things with HN community to make sure my understanding of the application is correct.

- Are receivers and senders the only entities able to access privately sent messages/pictures/videos? Do the Signal servers not store any of this data?

- If it is not stored on the server, are all the media and content sent and received then stored on the user's device? In other words, will my usage be capped by my device's available storage?

- If Signal servers are hacked, are the security guarantees thrown out? Or, do the hackers only see encrypted data at all times, with no way to decrypt it themselves?

- Is Signal the most reliable mobile app in the secure communication domain? Are there better alternatives?

Thanks in advance :)