Question about the HDD state

Hi!

I've got an old HP ProDesk SFF converted into home server with:

• 1x 120 GB Patriot Burst
• 3x 3.0 TB Seagate ST33000650NS

Now, the drives are quite old and their SMART values are not great, not terrible.

Should I even bother with this, or should I just leave it be? It seems like a pity to me to throw away 9TB of storage and that is basically what is valuable in this system...

So what do you think? Should I put Proxmox on it and use it for cloud storage in RAID?