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Kopia might meet your needs.

https://kopia.io/

(Edit, because I’ve got more time :)

• Runs native on Windows and macOS. Doesn’t need Windows WSL or a wrapper
• Can run as client-server, or standalone, backing up to local, network, S3, WebDAV, various clouds, etc
• Open source
• Snapshots are incremental, encrypted, and deduplicated
• CLI and GUI

I’ve been happily using it for years for similar needs (mixed systems)

To be fair, commercial long-life nickel-iron batteries are already being sold for grid storage. The main reason they aren’t used more widely is they cost more up front.

That’s ok, because they still cost less than alternatives over the full life span of the battery.

The risk is that the higher purchase cost required will likely be wasted as new battery tech surpasses it long before its life is over.

So for now, it’s all about weighing opportunity cost, tech lock-in, and early obsolescence