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I was wondering what's the best way to host wallets as I'm nearing a few hundred of them now.

a Mint linux box with backups to a NAS then to cloud would be best, eh?

I use a raspberry pi for NEBL otherwise hardware sticks. Just make sure your raid is synchronized.
Since I live mobile is far safer for me to keep cold storage plus I am a hodler

paper wallets it is! lol