outbound network traffic originating from a client is filtered , to check for files targeted for upload to remote sites . when a file targeted for upload to a remote site is detected , a remote storage location at which the client &# 39 ; s backup data is stored is checked for a copy of the detected file . if a copy of the file is located at the remote backup site , that copy is substituted for the client copy in the network transmission to the target remote site . by uploading online copies of files when available , the client upload experience is much faster , and local bandwidth is preserved for other tasks .