I've decided to make a full backup from my SSD disk to flash drive. According to archwiki general backup is done with following command:rsync -aAXv --exclude={/dev/*,/proc/*,/sys/*,/tmp/*,/run/*,/mnt/*,/media/*,/lost+found} /* /path/to/backup/folderBut what I supposed to do, if full backup needed? For instance, to launch rsync from usb when basic system would be broken and have fully ready-to-work last working state.The other detail is that on my primary drive bootloader is GRUB and Syslinux is on usb stick. I'd like to avoid synching this at all. If I understand correctly, /BOOT/* should be added to --exclude or maybe there is something else? 
Backup to flash drive using rsync
arch linux;rsync;backup