One or two systems for NAS with long-term HDD pool and short-term SSD pool?

TrueNAS General
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I am looking into a NAS

I am thinking that I will need a hybrid solution:
40+ TB archive for long-term storage (think dumps of digitized old family videos and photos, backup of some parts of the readily accessible storage)
And 4+ TB SSD for readily accessible media, backups, any VM storage etc.,

The long-term storage would almost never be accessed, mostly when digitizing new stuff

The short-term storage would be accessed often, and host a few services like Home Assistant and so on

Would this best be put together as one system, using e.g., the Aoostar WTR Max, or should I set up two systems?

For one system, it would be a requirement that I can put the hard drives to sleep, due to power consumption and noise in my apartment. According to this thread, that should be possible?

If that doesn’t work so well, I could rather have two units and power off / use wake-on-lan? Can a file share be woken up if accessed?

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You can’t wake-on-LAN to power on, you’d need a server with a BMC, send a command to power on, and wait for TrueNAS to be up and running.
So a single system with two pools should be the easiest way to go—although you might have to prevent some services from spinning up the HDD pool.

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From a performance POV, a single pool makes more sense to me (fusion) but if you want to spin down the HDDs, then two pools will be necessary.

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Do you have a planned backup of the 40+TB pool? You don’t want that as a single source of failure for dumps of digitized old family videos and photos.

You may be better off with two machines or a single machine with offsite backup of your important archive data.

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I’m planning to set up one system at my place first, and then another at a family member once it’s running well

The family member will likely only have the HDD pool, they will replace an assortment of external hard drives

Hetzner Storage box also seems quite affordable for offsite backup

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Yes, Hetzner storage box works nicely for me as offsite backup of Truenas.