rsync.net advertises
> a ZFS filesystem, accessible with any SSH/SFTP tool, running on a UNIX system.
You're paying for that though, rsync.net starts at 8c/GB/month (for 10+TB), the smallest offering (under 1TB) is 20c/GB/month), by comparison S3 is 2.75c to 3c/GB/month in standard storage (and 1.25c/GB/month for IA)