I often use Clonezilla to backup my system. I have a few different partitions on my main boot drive and have an additional disk array to which I perform the backups. Essentially, I have a EFI drive, a Linux BTRFS boot partition, and an NTFS Windows boot partition.
Clonezilla is awesome and does exactly what I need, but it's a bit of an inconvenience to have to shut down, plug in the USB boot drive, plug in my physical keyboard, and manually do the backup.
Is there a way to run a Clonezilla-like backup from a running Linux OS so I can backup the entire boot hard disk to a file on another drive?