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.
Borg backup. You should be able to install it on your Live session, then restore to the target mount point.
Pika Backup is another user-friendly Borgbackup GUI.
https://apps.gnome.org/en-GB/app/org.gnome.World.PikaBackup/
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.
Timeshift. Easy to set up. Easy to use, only takes a couple of minutes to ‘re-set’ your system back, if you break it. If you want just to backup files, documents etc then Cron. I use both. They are standard Linux programs and easy to use
Restic is my favorite, but you really would need to be familiar with the terminal, cron tasks, etc. to consider it a viable option.
Sounds like a well thought out solution, but we need proper programs which can handle backups, like some mentioned in this thread.
Have you looked to see if rdiff-backup is included? It works off of rsync but provides incremental backups and restores. On my servers I set up a script that excludes system folders like /dev, network mounts, and the log files, but it grabs pretty much everything else. Once the script works just set up a cron job and forget about it.