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Are there any real concerns about Ventoy and security? So ig I use it to boot installer, the installed OS can be backdoored? Or is it just some „possibility”, but rather unreal?

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You're going to have to weigh the Chinese origins against what threats and risks you can not or will not accept.

Personally, I don't and use stuff like Rufus[1] instead.

[1]: https://github.com/pbatard/rufus

Rufus does not seem to have anywhere near the feature set of Ventoy, so not really a replacement.

netboot.xyx is also killer though slightly different. I installed a permanent netboot version on my home server so I never need to boot an install disk again, but you can also flash it to USB.

Does it work with ISOs from the USB? It looks like it would still need a remote host.

Netboot.xyz can itself boot from USB, but it does not then boot arbitrary isos off the USB like Ventoy. That's what I meant by it's slightly different, it chain loads netboot images. I find that's what I almost always want to do with a tool like this or Ventoy, so it suits my (and probably many) people's needs. But yes, it's not an exact replacement.

You can add arbitrary netboot images, but I'm not actually sure how much it can do with no network at all.

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