If your communications are intercepted, stored, but then never looked at, and eventually deleted - this is functionally equivalent to having never been collected at all.
It's very very difficult (some people say impossible) to assure 100 percent that people's data have been safely stored and transmitted for their whole retention lifetime.
Assuming this is an incident and not a coverup.
https://www.aclu.org/issues/national-security/privacy-and-su...
I understand that some disagree with the other (and past) positions of the ACLU and may be disinclined to trust its website. Fortunately this issue isn't a particularly party-based one. Here's another good source, although it also says a lot about the history of the leaks:
https://www.eff.org/nsa-spying
If there is any accurate secondary source that is clearly conservative, It'd be welcome for me to see it in a reply. There's no particular reason why we'd have to porkbarel this issue - presumably there would be no party affinity at all.
Edit: I know that there is lots of text behind those links, but the issue is an expansive one. I sincerely invite you to read them!
You can find a lot of this in the things Julian Sanchez has written for Cato.