See also Collaboration Tools.
Objective: have a system that lets people participate in a digital library, basically a small group file server that syncs to multiple places (US and Russia most likely)
Yandex Cloud storage classes 
looks like "Cold" currently at $5/TB/month is the right answer
VPSes are pricey to increase the GB of storage, so probably fronting cloud storage is best (RuVPS products for example, CLO is similar)