Having trouble with snapshot plugin

Hi – I’m working to create a snapshot of my site – I was able to connect Dropbox and AS3, but it seems to crap out when snapshot gets to my files. It backs up my database, but once it starts backing up my files, the process crashes – the error message I’m getting is a 500 internal server error on the plugin page : http://www.arrowrootmedia.com/wp_Secure-06.2011_medialevy/wp-admin/admin.php?page=snapshots_edit_panel&snapshot-action=edit&item=1353562672.