Thank you for the reply.
My main concern is that QNAP has quit updating the OS. (I do not blame them) I like this QNAP hardware since it is low powered and silent. Mine is running 24x7 for at least 7 years on my desktop and I bought it second hand.
Although currently major security updates are given, but in near future it will be ceased. Second, I do not want to spend for a new hardware, buying a new QNAP does not add much value if I do not spend a fortune for SMB or enterprise class hardware. Building myself a nas, will not cost less, since there is very few suitable low power, small form factor, silent platform, and it will be hassle. I learned about unraid a couple of days ago. Before unraid I was looking for a platform for freenas, but freenas requires powerful hardware, ecc rams costs almost as much as the platform.
Anyway thank you again for the replies. I quess I will live with this faithful QNAP for a while and think about what to do...