In some examples, a server may receive a data file from one or more computing devices, and may store the data file at a storage system provided by a data storage service. The server may determine a number of copies of the data file to be stored at the storage system based on a number of a set of computing devices that store the data file. For example, the set of computing devices may be outside of the storage system, and the determined number of copies of the data file to be stored at the storage system may decrease when the number of the set of computing devices that store the data file increases. Additionally, the server may adjust the number of copies of the data file stored at the storage system based on the determined number of copies of the data file.