While there are numerous methods out there for backing up data, it really boils down to a couple of options, file-based and image-based.
File-based only backs up the individual files and folders. Recovering from a disaster would likely take some time since you would need to re-install your operating system and any ancillary programs prior to restoring your backup.
Image-based backups are different in that they back up a copy of the operating system and all the data associated with it, including the system state, third party applications, configuration, etc. and saves it as a single file. Some even offer the ability to “virtually boot” a backup file either for disaster recovery testing or an actual disaster event.
Given the speed of recovery, it makes sense for business to look at image-based over file-based.