In this paper, we present O-3, a social link based private storage cloud
for decentralized collaboration. O-3 allows users to share and
collaborate on collections of files (shared folders) with others, in a
decentralized manner, without the need for intermediaries (such as
public cloud storage servers) to intervene. Thus, users can keep their
working relationships (who they work with) and what they work on private
from third parties. Using benchmarks and traces from real workloads, we
experimentally evaluate O-3 and demonstrate that the system scales
linearly when synchronizing increasing numbers of concurrent users,
while performing on-par with the ext4 non-version-tracking filesystem
