FreeNas 9.3 won’t boot properly

I have two questions within this post so please bear with me.

I built my server in 2015 and has faithful served me for ten years using Freenas 9.3. Just this past week, I couldn’t connect.

Adding a keyboard and monitor and booting from the two original USB drives, I can see it does boot, but with considerable errors such as “WARNING: failed to start dhclient” and network address listed as http://0.0.0.0.

I bought two new 16GB thumb drives suspecting the originals were corrupted, to use a boot drives, at least to recover my data. It took me awhile to find a copy of FreeNas 9.3 file (not sure it’s correct) , used Rufas to copy it to a thumb drive and tried to boot it, but it didn’t work. I got a message saying “This is a NAS data disk. You can not boot from this drive.” I think the process I used, did not create a boot drive. My concern is saving my data.

Where do I go from here?

My second question: I know that my setup is ten years old, and I do plan on upgrading to TrueNas, with a SSD as a boot drive. Is it possible to install the latest version of TrueNas and still save my data? I use my server for backing up my documents, pictures, music and I don’t stream movies. I know that my MB is capable of a significant CPU upgrade and I can add another 8GB’s of memory. Would it be worth it to do so, or is my system so outdated, I should be looking for a new MB too?

Here is my current setup:

Case

  • Lian Li case PC-

Motherboard

  • Tyan S5533 mini ITX Motherboard

Power Supply

  • ANTEC PS EA-380D GREEN RT

CPU

  • CPU INTEL|CELERON G1840 2.8G 2M R 2cores, 2 threads

Memory

  • (1) Kingston 8GB 240-Pin DDR3 1600 (PC3 12800) ECC Unbuffered Memory KVR16LE11/8KF w/TS Server

Drives (mirrored)

  • WD (2) 2TB Red drive WD20EFRX 64M

  • WD (2) 1TB Black drive

Boot Drive

  • (2)USB Sandisk 8GB SDCZ33-008G-A46 R (existing)