I've added some text to the readme to clarify the distinction to other backup tools and also to express my personal use case:
Why block device backups?
dd_backup operates at the block device level, offering a distinct approach to backups compared to many other backup tools that work at the file-system level.
When performing backups at the block device level, you will get a complete backup of the device, capturing all data, configurations, and file systems as they are, without any abstraction or modification. This comes at the cost of more time and more storage space on creating, since all sectors are captured including empty ones.
The main reason why you may like to have a block device backup is backing up the operating system with all partition and storage configurations in the same way as your other data. In the event of a sudden hard drive failure, you can quickly restore the entire block device, enabling a faster recovery process of your OS device.
It's even possible to combine this approach with backup tools operating on the file system layer, since you can use a loopback device to read and write the image file, created by dd.
You can run dd_backup once to create the initial block device backup and then use the resulting image file for restoration or for subsequent file-system level backups, capturing specific changes and modifications.
In my personal use case, I run dd_backup before going to sleep, as the creation time is not a concern for me.
I employ it on a bootable live Linux system that is configured to automatically run dd_backup upon boot.
This setup enables me to back up my home server, which lacks a display or keyboard, without the need to physically move the server and its external storage devices to my desk.
Additionally, I have two physical hard drives in my main computer, one for my Linux system and the other for my Windows system, both sharing a boot partition.
In the worst-case scenario of one hard drive failure two operating systems are not bootable.