If you use cvs system, you need to export files first
(using svn)*
svn export files/path export/path
* Maybe you need to use before
svn add * --force
Go to export/path and get the last new/modified files you want
cd export/path find . -mtime -N -ctime -N | cpio -vdump ../final_files
N are the days that you want to get, so if you need to get files from 7 days ago then you write:
find . -mtime -7 -ctime -7 | cpio -vdump ../final_files