All Free or have free versions: AOMEI Backupper, Clonezilla, Macrium Reflect, Redo Backup, Paragon Backup & Recovery, BackUp Maker, EaseUS Todo Backup, EaseUS DiskCopy, and many more are out there.
AOMEI is the most popular, I personally like Redo Backup, but you have to have legacy boot set up in the bios to use the boot disk version on UEFI/Windows 8.1 systems.
Edit: Added links