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The idea of Rescue Media is that you create it proactively so that even if Windows is dead, you'll have your pre-built Rescue Media on a disc or flash drive and will be able to boot your PC from that instead. The idea is NOT to wait until disaster strikes to get around to building Rescue Media. This is why the very first prompt you see upon launching Reflect, before even setting up a backup, asks you if you want to create Rescue Media. And since Rescue Media Builder can generate a Rescue Media ISO file, you can back that up anywhere you want and use it to burn a disc or create a bootable flash drive from a variety of different PCs and OSes. So as long as you have that, you still wouldn't necessarily need a Windows system to generate a usable disc or flash drive.
In terms of using it with different PCs, Reflect's licensing policy (for typical license purchases as opposed to special licensing arrangements) indicates that Rescue Media created by a paid version of Reflect is only licensed to be used on a PC holding a license for that version. But if you have multiple PCs, each of which has its own licenses for the same edition of Reflect, then I would be surprised if Macrium objected to you using Rescue Media built on one PC with your other PCs. In terms of whether it will work, generally yes, although you might find that some systems require additional drivers beyond what's built into WinPE/RE, in which case you can assemble a driver library on your main PC, which will contain all drivers necessary for all of your other PCs, and from that point on any Rescue Media created by that PC will include those drivers, and thus the Rescue Media it builds should be usable on any of your PCs.
In terms of Linux, Reflect used to have a Linux-based Rescue Media option, but it was dropped a few years ago.