I have researched a little bit and I haven't found a sound solution to downloading all attached files from all content types across an entire site in an single action. I have found a couple modules like Backup & Migrate, or its plugin Backup & Migrate Files that perform similar functions, but nothing to effect that I need. I am trying to archive all attached files for a schools site. The site is drupal7.
If you want the entire
files directory of uploaded files, you can do this with Drush:
drush rsync @source.target:%files/ @destination.target:%files
This relies on having
%files defined in your
path-alias part of your alias definitions for drush.
Alternatively, you could ssh into the server, and tar/gzip the files directory, then scp it down to your machine (or sftp/ftp, I suppose).
Either of these methods will bring the entire files directory with it, which will have all uploaded files, any image derivatives (generated image style files) as well as cached css/js files. If you use the drush command with arguments, you can exclude directories you don't want.