This a storage function not a communication function.
All communication platforms have a storage function, some are in the client some are in the network.
A lot of supposedly secure communication is readable on the network servers that process it (authorities make it so)
Those that use client side encryption are difficult to replicate where you lose the client device unless certificates can be recovered etc.
If you can't reach the server that holds your message then you are screwed and if the company providing that server goes bust you are screwed.
if you use a google, microsoft, whatsapp you will be monitored, your ideas read, copied, stolen - prove it???
With NXT
the message is encrypted in the client but your passphrase unlocks it
it is unreadable anywhere except on a client that has the keys
the network of NXT nodes holds it so you can always get to it unless NXT ceases to exist.
no one can search, copy steal your ideas or communication.
You could also use arbitrary messages to communicate to yourself (sorry store) those secrets that you want to remember.