Data backup apparatus and data backup method

A magnetic tape reproduction device that reproduces a series of data from a magnetic tape and a storage medium on which data continuing to data recorded on the magnetic tape is recorded, comprising:

• a magnetic tape access device that has a magnetic tape attachably and detachably set thereto and gains access to the set magnetic tape;
• a storage medium access device that has a storage medium attachably and detachably set thereto and gains access to the set storage medium;
• a reading destination determining circuit that determines timing at which a reading source for data is switched from the magnetic tape to the storage medium according to address information of data written on the storage medium;
• and
• a reading circuit that reads data from the magnetic tape by controlling said magnetic tape access device, switches the reading destination for data to the storage medium at the timing determined by said reading destination determining means, and reads data continuing to data read from the magnetic tape from the storage medium.

A magnetic tape apparatus that stores data provided from an external device onto a magnetic tape, comprising:

• magnetic tape access means for having a magnetic tape attachably and detachably set thereto and for gaining access to the set magnetic tape;
• storage medium access means for having a storage medium attachably and detachably set thereto and for gaining access to the set storage medium;
• and
• a writing circuit that writes data provided from the external device on the magnetic tape by controlling said magnetic tape access means, and switches a writing destination for data from the magnetic tape to the recording medium when it is determined that data cannot be written on the magnetic tape, and writes address information, which indicates a position on the magnetic tape where writing data should be originally written together with data continuing to data written on the magnetic tape, onto the recording medium by controlling said storage medium access means.

A magnetic tape reproduction device that stores data provided from an external device onto a magnetic tape, comprising:

• magnetic tape access means for having a magnetic tape attachably and detachably set thereto and for gaining access to the set magnetic tape;
• storage medium access means for having a storage medium attachably and detachably set thereto and for gaining access to the set storage medium;
• reading destination determining means for determining timing at which a reading source for data is switched from the magnetic tape to the storage medium according to address information of data written on the storage medium;
• reading means for reading data from the magnetic tape by controlling said magnetic tape access means, switches the reading destination for data to the storage medium at the timing determined by said reading destination determining means, and reads data continuing to data read from the magnetic tape from the storage medium.