A company has 100GB of data that needs to be automatically backed up daily, and needs to be stored for 20 years. Which of the following backup media is the BEST solution for archiving the server data?

Tape media, such as LTO (Linear Tape-Open), is the best solution for long-term archiving due to its low cost per gigabyte, high storage density, and proven longevity for data retention over decades. Tape libraries also facilitate automated daily backups and offsite storage for disaster recovery.

A SAN (Storage Area Network) provides high-speed block-level access to storage, primarily for active data and applications, not typically used as a cost-effective long-term archival *media* itself.

Flash storage (SSDs or USB drives) is significantly more expensive per gigabyte than tape for large capacities and long-term cold archival, and its data retention can be less predictable over 20 years without power compared to tape.

Optical media (CDs, DVDs, Blu-rays) offers limited capacity per disc, making it impractical and cumbersome for daily backups of 100GB over 20 years, and automation capabilities are generally poor compared to tape libraries.