userfilebak copies file to RECENTBACK DIR matching old of given dates
userfilebak(dates,currentdir);
userfilebak(1,1); % Operates on current directory for files of 1 day old
userfilebak; % Operates on all user files' directories of 1/2 day old
userfilebak(dates); % Operates on all user files' directories
dates = datevec(now); % can be used
dates = [2003 10 13 17 43 00]
for [year month day hour min sec]
if ischar(dates), datess = clock;datess(4) = str2num(dates);dates = datess;end
userfilebak('9') % copies files created after 9 AM
userfilebak('21') % copies files created after 9 PM
userfilebak(1/24)
RECENTBACK DIR is removed if there is no file copied
Rezaul, 2004