Look into proxmox, its a open source linux os that lets you deploy vms from a web browser.
I like this proxmox tutorial series: https://www.youtube.com/watch?v=LCjuiIswXGs
Type 1 hypervisor like proxmox are used everywhere in industry. It provides a nice GUI to do complex deployments involving clustering and Redundant Arrays of Disks
Here's some other ways to add redundancy to your setup: https://nullcount.com/how-to-add-redundancy-to-your-lightning-node/
I prefer to have many umbrel vms, one for money stuff and separate for media, socials, etc.
How much RAM? Depends on what all you want to run. I like to run max_mempool really high so I do 16GB per VM, but you could run comfortably on 8GB (VM not host memory)
+1 on proxmox, good call. that's the way I have set it up. Make sure you give enough ram for your bitcoin node if you run that.
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Proxmox is a solid recommendation. Planning to try it out. Thanks.
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