I have a hot storage NAS that backups to a warm storage NAS.

I backup every week and scrub every month.

I have 2 x ZFS1 pools that contains 3 x 20TB disks each.

With ECC ram, scrubbing, and independent pools, it’ll take a house fire to kill my local storage.

I also have a constant backing to Backblaze and yearly encrypted backup that I ship to a friend across the world.

NUCs have an iGPU, you should be fine.

I use OpenMediaVault for my NAS

But if you don’t want to be the IT of your family, I’d just go with an easy solution like WDs my cloud or one drive

Encoding uses the iGPU. The iGPU should usually support 4k 60fps if it’s a recent CPU.