The NSA certainly have the ability to record pretty much everything. I read they are building out their storage capacity towards a yottabyte of data.
Gathering and storing the information isn’t really a huge issue for them.
Mining this amount of data is far from trivial though. That’s where the real computing power comes in. There is definitely a limit to how much data you can process and turn into useful information.
So yes I believe they routinely monitor and record everything (or a great deal) but only a tiny proportion of it is mined or monitored.
PS:
Semtex, Uranium, Enrichment, Iran, North Korea, Jihad