Any mitigation against date degradation?

Exactly, software RAID instead of hardware RAID.

If build own NAS either go for second hand hardware (CPU, mobo, RAM, PSU, case) so that it's more affordable than prebuilt NAS. Or because prebuilt NAS can't accommodate or too expensive for your need so better to go building own NAS route.

160TB!

But you need to be good in hardware and software installation and troubleshooting.
Any mitigation against date degradation?

Which is why you have backup. Slowly get more disks.

Once HDD past the 2/3 years mark, you can start migrate data to other HDD or have duplicate.
i haven't tried enterprise hdd yet, but for desktop class 3.55'' HDD that is pretty much their lief expectancy, i owned a lot of hdd,  many of them couldn't last more than 3.

I'm considering ordering Silverstone Kublai KL04

https://www.silverstonetek.com/product.php?...area=en#fgo-top

Crazy mad amount of storage. lol

I'm looking to store all my media that is currently scattered through multiple external drives into some internal drives and stuff them into an enclosure. I want to make it redundant and currently am thinking of doing Raid 1 or Raid 5 so I wont fall into despair if a drive fails on me. I have already lost too many external drives due to drive failure. Primarily gonna be using it to store all the obviously legally downloaded content. So when I needed to I will connect my laptop

My requirements:
- Minimum 4 bay.
- Raid ready
- usb 3.1 gen 1 or gen 2 (output using usb c would be a bonus)
- sub RM1k

If i am missing anything let me know and I'll update asap.

Wut u guys think of buying refurb desktops to start a NAS? Though I think it needs to be at least half in cost to the most-cheapest buy-new-component DIY plan.

Took a look at shopee but the cheapest and numerous remains BTX-era PCs so have to be careful not end up with those traps.

If you just want RAID-1 and have 4 free sata port on your mobo, you basically can have a pair each for RAID-1 using Windows 10.

Why not get/build a NAS? You can centralized your data storage and can be accessible by PC or laptop or anything else that connected to your home network.

If you good at technical and troubleshooting then can build your own NAS using PC components for about RM1000, not including HDD. FREENAS with ZFS filesystem is usually the recommended choice. It support protection against bit-rot.

If you don't want to delve into too much technical but want something highly functional like FREENAS then get a NAS, for 4 bays prepare about RM2000 for Synology or RM1500 for Asustor. Synology been in market for much more years so their software have much better function and more stable while Asustor more value for money but software not as polished as Synology. The best part is both support BTRFS filesystem, a protection against bit-rot. The downside is BTRFS didn't support RAID-5 or RAID-6 so you have less storage space.