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netboot.xyz
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The iso images are typically locked at a certain verison. The update repositories sounds like what you are looking for to cache updates. Look into theforeman.org and specifically the plugin Katello. This is an upstream for Red Hat's Satellite product. Another option would be Canonical's MAAS. Both of these options Sound like what you are headed for unless you really just mean synchronize into a folder and store the images in which case yeah.....just use rsync.
It's old because I haven't updated it (had done it for a specific project), but you can look at this repo for an example.
There is https://netboot.xyz/ but I'm always wary of booting an image over the Internet. But it would be the most convenient way if I could trust it.
