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3:2:1 - Cattle not pets - If your data is backed up in multiple sites, the death of one site shouldn't overwhelm you, and give you time to recover.
If your primary site drives are getting above their designed lifetime, rotate them out, sure - but they could be used as part of the backup architecture else where (like a live offsite sync location with enough tolerance for 2 disk failures to account for the age).
3 copies of your data; 2 types of media; 1 copy offsite.
I mean if it's homelab, it's ok to be pets. Not everything has to be commoditized for the whims of industry.
"Cattle not pets" in this instance means you have a specific plan for the random death of a HDD (which RAIDZ2 basically already handles), and because of that you can work your HDDs until they are completely dead. If your NAS is a "pet" then your strategy is more along the lines of taking extra-good care of your system (e.g. rotating HDDs out when you think they're getting too old, not putting too much stress on them) and praying that nothing unexpected happens. I'd argue it's not really "okay" to have pets just because you're in a homelab, as you don't really have to put too much effort into changing your setup to be more cynical instead of optimistic, and it can even save you money since you don't need to worry about keeping things fresh and new.
"In the old way of doing things, we treat our servers like pets, for example Bob the mail server. If Bob goes down, it’s all hands on deck. The CEO can’t get his email and it’s the end of the world. In the new way, servers are numbered, like cattle in a herd. For example, www001 to www100. When one server goes down, it’s taken out back, shot, and replaced on the line."
~from https://cloudscaling.com/blog/cloud-computing/the-history-of-pets-vs-cattle/
Yep, numbering's the key.
When you create NAS01, you know there's going to be a NAS02 one day