The Save to Disk might not be intended to be used to create backups but I use it for that in addition to saving the Calibre library folder. After having lost 2 external HD's with no warning and loosing ALL of the backups stored there, I'm a bit paranoid... and store my important files in several ways.. probably more than necessary but I hate not having the security.
Plus, I much prefer having all of my ebooks in a "list" format and not in the directory format of the Calibre library where you have to search for the author and then the book title in the author's directory. Save to Disk gives me that feature so it does make me happy.
I have both the Calibre library AND my Save to Disk directory saved to the Cloud as well as burned on dvd and on usb drives along with all the other files I feel are important to me
