Explanation:

Backup is the process of creating copies of data from an original source and storing them in a separate location or on a different medium. The primary purpose of a backup is to ensure that data can be recovered in the event of data loss due to hardware failure, accidental deletion, cyber-attacks, or other unforeseen circumstances. Option (b) accurately describes this process: 'Copy to save a data from original source to other destination'. Option (a) 'Connect his network to more component' is unrelated to data backup. Option (c) 'Filter an old data from new data' describes a data management or analysis task, not backup. Option (d) 'Access data from tape' describes a method of data retrieval from a specific storage medium often used for backups, but it is not the definition of backup itself. Hence, (b) is the correct answer.