Name finding for my SaaS Product

I founded a startup and already built a prototype. It’s a document management system designed for the broad masses — highly reliable, isolated, redundant, and secure. The idea is that it’s so secure people could confidently throw away their physical documents without worrying about losing anything.

Right now, I’m working on a UI redesign and a promo video (which I’ll also use for Kickstarter). My current challenge is finding the right name for the product.

Subscribers will get their own subdomain, like:
customername.productname.eu

Here are my ideas so far:

1. Origami → The promo video will feature an origami character. Motto: make beautiful things out of paper instead of printing documents on it.
2. papl → Short for paperless.
3. Sovrano → Hosted in a highly redundant sovereign cloud, highlighting sovereignty and reliability.
4. Archiv → Pretty self-explanatory.
5. DocVault → Also quite clear.

Which one do you prefer? Do you have any additional ideas?