Normally, we use magnetic tapes for following purposes:-
For sequential data processing applications. For example, we often use magnetic tapes for applications in which contents of an inventory master file (permanent source of inventory data) is updated periodically (weekly, monthly, etc.) using a transaction file (containing data reflecting inventory activities during the period) to create a new inventory master file, which is used in the next processing cycle.
Backing up of data stored on an on-line storage device such as a disk, for its off-line storage. However, over time, tape will become more of an archive medium because users are increasingly using disk-based solutions to meet backup requirements.
Archiving of data used occasionally. Tape continues to be the preferred medium for data archival.
Transferring of data programs between two computers not linked together.
Distribution of software. Vendors often distribute software products or their updates on magnetic tapes.