1. A method of retaining data about a plurality of assets, the assets including network assets and non-network assets, the data including network data and non-network data, the network data being obtainable over a network, comprising: for each asset, associating a file with the asset, the file including spaces for holding data, each space being associated with a type of data; for a network asset, populating a space associated with a first type of data in the associated file with the network data; for a non-network asset, populating the space associated with the first type of data in the associated file with non-network data.