Which of the following backup types would BEST be used for fast backups and allow for offsite storage?

While tape allows for offsite storage, it is generally much slower for initial backups compared to disk-based solutions.

Disk-to-Disk-to-Tape (D2D2T) allows for the initial backup to occur rapidly to disk storage, which offers much faster read/write speeds than tape. After the initial disk backup, the data is then asynchronously copied from the disk to tape for cost-effective, long-term archival and offsite storage, combining the benefits of speed and portability.

Optical media offers offsite storage but typically has limited capacity and slower backup speeds compared to disk, making it less suitable for large-scale, fast backups.

Disk-to-Disk (D2D) provides fast backups but does not inherently provide a mechanism for easily and cost-effectively taking data offsite without additional manual steps or specialized disk transport.