Mike,
There are companies out there who will scan archive and index documents for you. Our Trust is heading in that direction. Old records are scanned and you are given CDs with the image of the document plus an indexing and search facility.
These can be put on a central server if you want.
Have a word with the patient records department they are usually quite up on records management.
It is a simple task to do yourself just scan the document and store it in a logical file system - easy but time consuming.
Robert