Choosing the right storage medium based on the life of media, the legal filing, frequency of use and cost of archiving.
Life of storage media
If you want to save your documents on CD-ROM, be aware that the life of your data will be limited. Beyond 2 to 10 years for the original CD-ROM and 2 to 5 years for cd-rom burned, your data may be partly erased or impossible to read. The lifespan depends on the assumed exposure to light, shocks and the quality of the cd-rom. This conservation problem is especially true if the images or pictures. To maximize conservation, store cd-rom in a dark, cool and dry - often the place not the most accessible!
When the storage disk drive or server, the reliability depends on the quality of equipment. The main board to meet for more safety is the diversification of your storage media.
These problems lead naturally to consider a regular migration of data to your media is more recent and more secure. Be careful not to unnecessarily oversupply in new equipment. While reading your old media by more recent material is still possible, there is no reason for alarm.