Just to give you an idea...

CD-ROM

A single CD-ROM can store a sizeable 30,000 documents, or the equivalent of 15 standard archive boxes.

DVD

A single DVD can store over 3 times the amount of a CD; 100,000 documents, or 50 standard archive boxes!

USB Stick

The holy grail of portable storage devices, a USB flash drive can hold an incredible 400,000 documents - equating to a space-saving 200 standard archive boxes! The device can be used again and again, majorly outweighing the pros of CDs and DVDs which can only be written to once.

780MB; 30,000 documents

4.7GB; 100,000 documents

16GB; 400,000 documents