Usually, you need to run a pre-boot environment from startup media to restore a system image since doing so from within your main OS isn't possible. But that extra protection comes at the price of more complexity in setting up and restoring. Some backup services can even update a disk image nearly continuously. A disk image contains every bit of data on the drive and offers stronger protection since it enables you to recreate the whole system after a hard drive failure. What's a Disk Image Backup?Ī step further than the simple copying of files is copying the entire hard drive, including system files, known as a disk image. With incremental backups, you need the latest full backup and all the intermediary backup data to restore a file to its original state, whereas, with differential backup, all you need is the last set of differential backup data and the first full one. Differential backup saves all changes from the last full backup. Incremental backup saves system resources by only backing up changes in files from the last incremental backup. A full backup is when all the information you've selected for backup is copied in its entirety. More granular options include whether backups are full, incremental, or differential. Usually, you also have the option to tell the backup service to monitor your drive for changed or new files to back up as they occur. Most backup solutions let you schedule scans of your hard drive for new and changed files daily, weekly, monthly, or continually (or at least every 15 minutes or so). Should you lose your local files, either through disaster or simply by deleting or overwriting them, you can just restore them from the saved copy.įor this to work, the copies of your files must be updated regularly. That storage can be another drive, an external drive, a network-attached storage device (NAS), a rewritable disc, or the cloud-meaning someone else's servers. The concept behind backup software is pretty simple: You make a copy of your files on storage separate from your main hard drive.
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