Information System

An information system comprising a data center having a center file server, and multiple sites each having a local file server storing user files of multiple users, wherein

• the local file server is configured to calculate a predicted arrival time of a user having logged off from the local file server to the multiple sites;
• based on the predicted arrival time, determine a priority of the user files to be replicated to the center file server;
• and
• replicate the user files to the center file server in accordance with the priority,
• wherein
• the local file server is configured to determine whether the user is approaching its own site based on the location information of its own site where the local file server is located and the location information of the user at multiple points of time;
• and
• download the user files of the user determined to be approaching its own site from the center file server, before the user logs in to the local file server, and
• wherein
• the local file server is configured to store multiple information of time when the user has been determined to be approaching its own site, associated with the user information, in an approach determination history table;
• store multiple information of time in which the user has logged into the local file server, associated with the user information, in a login date and time table;
• use the approach determination history table and the login date and time table to calculate a login probability in accordance with the following calculation;
• (number of times of login to the local file server of the user determined to be approaching its own site)/(number of times that the user had been determined to be approaching its own site);
• and
• based on the login probability, calculate an upper limit value of download of data of the respective users.