Techniques for selecting a backup type based on changed data are described in various implementations. An example method that implements the techniques may include identifying a backup policy that describes a source of data to be backed up during a backup operation. The method may also include determining an amount of data that has changed on the source since a previous backup of the source. The method may also include selecting a type of backup to perform based on the amount of data that has changed on the source. The method may also include causing the backup operation to be performed using the selected type of backup.
