Final answer:
The term for a backup that includes only data changed since the last backup is an 'incremental backup'. This method is more storage and time-efficient compared to a full backup but can lead to longer restoration times.
Step-by-step explanation:
We call it a incremental backup when it is backed up with only the data that has changed since the last backup of any kind. An incremental backup saves storage space and reduces the time it takes to complete the backup process, as compared to a full backup which copies all the data in a system. However, during a restoration, all the incremental backups since the last full backup need to be processed, which can be time-consuming.
The first time you back up this folder, you create a full backup, which copies all the files in the folder. The next time you back up, only the files that have been added or modified since the last backup will be included in the backup. This is called an incremental backup.
Incremental backups are useful as they save time and storage space compared to full backups, especially when dealing with large amounts of data.