I am currently using EndeavourOS for my laptop. Is there a backup solution that is easy to use, and can be run from the EndeavourOS install media without internet? (RSync is included, but no other backup tools are included, to my knowledge.) I don't want to use another ISO due to space constraints on my USB.
Pika Backup is the most user-friendly GUI for Borg. Vorta UI is powerful but complex. Pika only shows you the absolute basics: where to keep the backups, what to include, what to exclude, list of snapshots, and schedule options.
Are you serious? It actually does that? So you have a usb stick with the live environment, then you boot into that environment, then from there you install borg, plug in the other stick that has the back then just restore onto the internal drive and restart? Is that correct?
As long as you don't reboot, your live sessions act like a fully installed OS. At least with any of the LiveUSB sessions I've ever used over the last decade.
You can install, mount a backup image, then push it on to a mountpoint for your actual install to be restored.