So far, ownCloud users have only had the opportunity to choose between simple local file storage based on a POSIX-compatible file system or EOS Open Storage (EOS). The latter causes massive complexity during setup. More recent versions of ownCloud feature a functionality called Decomposed FS. This file system is supposed to bring oCIS to arbitrary storage backends and even scalable ones.

Source: LXer – Scalable storage for the masses to debut in ownCloud Infinite Scale