Blockchain integration would be cool for proof of “I thought of this first”.
It’d work like this:
Once a day/week/month or on request, a hash is calculated for all the files. These hashes are stored in a summary file, and the hash of the summary file is also taken; and the entire bundle is zipped up.
The final hash is added as the comment of a blockchain transaction (anywhere).
That makes it possible to go back in the future and proof that a specific file existed at a specific time, without disclosing all the other files that existed in the vault at that time.
(Because the hash would not exist without all the other hashes being exactly as they were, and so the file had to exist because it creates one of those hashed hashes.)
There was a lawyer in the UK who offered such a service before blockchain was a word, and they totally discontinued the service now.