An administrator needs to back up files from a server to the cloud. The administrator must select the most efficient type of backup technology that will update file changes the fastest and utilize…

File-level backups transfer entire files whenever any change is detected, which wastes bandwidth when only a small portion of a large file has changed.

Block-level backup technology operates at the sub-file level, identifying and transmitting only the specific data blocks that have changed since the last backup. This drastically reduces the amount of data sent over the network compared to file-level approaches, consuming the least bandwidth. Because the granularity is at the block level, even a tiny change in a large file results in only a small amount of data being transferred.

Snapshot-level backups capture a point-in-time image of a volume and are optimized for recovery speed and consistency, not for minimizing bandwidth on incremental updates.

Folder-level backups are logically equivalent to file-level backups and back up all files within a folder, making them similarly inefficient for bandwidth when only small changes occur.