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You could securely do this via sshfs. It depends on the security of the network between these computers. Just be aware that there is overhead associated with it since transfers must be encrypted/decrypted.
You could use NFS to share the disk and only allow access to your other VPS, but if you are interested in performance, you should check this article which shows useful benchmarks for both NFS and SSHFS. (contains optimizations for SSHFS)
Nfs or sshfs, i personally use sshfs to mount backup drive
sshfs has some performance costs and maybe reliability probs but it's convenient. nfs is supposed to be better. I generally back up with scp or rsync, and use sshfs when I want to remote-mount the backup machine to read in individual files.
have a look into xnbd https://bitbucket.org/hirofuchi/xnbd/wiki/Home
short version: create a big empty disk image at the other vps and export this via xnbd (ovz suffices on that one) now connect to that export on the first VPS (needs to be kvm though) and have a block device which you can even encrypt and setup any fs you like.
use iptables to allow only connection from that vps and secure your setup.