Which of the following backup methods requires the most number of data versions to conduct restoration? Full Incremental Composite Differential

The backup method that requires the most number of data versions to conduct restoration is **Incremental** backup. Here's how they compare: - **Full Backup**: A complete backup of all selected data. Restoration is straightforward since you only need the latest full backup. - **Incremental Backup**: This method backs up only the data that has changed since the last backup of any type (full or incremental). To restore data, you need the last full backup and all subsequent incremental backups, which can lead to a larger number of versions required for full restoration. - **Differential Backup**: This backs up all changes made since the last full backup. To restore, you need the last full backup and the latest differential backup, which means fewer versions than incremental. - **Composite Backup**: This is not a standard term in backup methodologies but can refer to a combination of different methods (like full + incremental), and the requirements can vary based on the implementation. Thus, among the standard options listed, Incremental backups typically require the most versions to restore.