Thank you for your reply.
I just want to combine the merit of
1) flexraid/unraid
i) reduce chance of total data loss;
ii) multiple parity (flexraid);
ii) incremental volume increase;
iv) add drive of any form, especially want to add drives via eSATA with HD rack later;
2) XPEnology (I love XPEnology but see many cases of total loss during SHR rebuild and don't want spend the same volume size on offline backup)
i) excellent mobile device apps
ii) easy management
Any ways can archive the above? if flexraid not feasible then unraid + ESXi + XPEnology also won't work?
If ESXi won't do, can Win 8 + Hyper-V + flexraid form a pool and pass to XPEnology do?