Taking Backup of Attachments(files) stored in the wwv_flow_files

hi,
i am buiding an application which involves uploading files and downloading of files, but now i am trying to achive purge of data in the wwv_flow_files but before purging i want to take the backup of all data or files in the wwv_flow_files, apart from manually downloading it to my desk , how else can i write a process which downloads all the files to my harddisk and then deletes all the files from wwv_flow_files.
Thanks in advance

On unix/linux:
cp <yourlogfile> <some directory where you keep your backups>

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