Did you even bother reading the documentation of fvault? If you did then the answer would be completely obvious.
Code:
nvault_set:
"Sets value of a vault entry and updates the timestamp."
fvault_set_data:
"Sets data of a key with current timestamp"
Code:
nvault_lookup:
"Retrieves full information about a vault entry."
fvault_get_data:
"Retrieves data specified by a key"
Tip 1: Even if I'm talking to myself, I have to say this: we don't ask "why" just because we want to give people a hard time. We ask "why" because in most cases people believe they need y thing to solve x but in fact, they do not(google xy problem) and likely there's a much better solution. But we can't recommend a better solution because we don't have any context, we do not know what the person REALLY wants.
Tip 2: saying "don't ask why" only makes people assume you want to do something bad and ask "why".
__________________