Numer Of Errors Appearing In Log File

I am seeing the following errors in log files after making my initial backup - and sending it to Dropbox. Is this anything I need to be concerned about? The backup *seemed* to complete successfully.

Notice: errno:8 Undefined variable: db_name /MYSITE.COM/htdocs/wp-content/plugins/snapshot/lib/snapshot_utilities.php on line 90
 2012-10-31 09:53:12: Notice: errno:8 Undefined variable: wpdb_prefix /MYSITE.COM/htdocs/wp-content/plugins/snapshot/lib/snapshot_utilities.php on line 91 

 2012-10-31 09:53:20: Warning: errno:2 fread(): Length parameter must be greater than 0 /MYSITE.COM/htdocs/wp-admin/includes/class-pclzip.php on line 2672
 2012-10-31 09:53:20: Warning: errno:2 fread(): Length parameter must be greater than 0 /MYSITE.COM/htdocs/wp-admin/includes/class-pclzip.php on line 2672 

 2012-10-31 09:53:24: Warning: errno:2 fread(): Length parameter must be greater than 0 /MYSITE.COM/htdocs/wp-admin/includes/class-pclzip.php on line 2672
 2012-10-31 09:53:24: Warning: errno:2 fread(): Length parameter must be greater than 0 /MYSITE.COM/htdocs/wp-admin/includes/class-pclzip.php on line 2672
 2012-10-31 09:53:24: Warning: errno:2 fread(): Length parameter must be greater than 0 /MYSITE.COM/htdocs/wp-admin/includes/class-pclzip.php on line 2672
 2012-10-31 09:53:24: Warning: errno:2 fread(): Length parameter must be greater than 0 /MYSITE.COM/htdocs/wp-admin/includes/class-pclzip.php on line 2672
 2012-10-31 09:53:24: Warning: errno:2 fread(): Length parameter must be greater than 0 /MYSITE.COM/htdocs/wp-admin/includes/class-pclzip.php on line 2672
 2012-10-31 09:53:24: Warning: errno:2 fread(): Length parameter must be greater than 0 /MYSITE.COM/htdocs/wp-admin/includes/class-pclzip.php on line 2672
 2012-10-31 09:53:24: Warning: errno:2 fread(): Length parameter must be greater than 0 /MYSITE.COM/htdocs/wp-admin/includes/class-pclzip.php on line 2672
 2012-10-31 09:53:24: Warning: errno:2 fread(): Length parameter must be greater than 0 /MYSITE.COM/htdocs/wp-admin/includes/class-pclzip.php on line 2672
 2012-10-31 09:53:24: Warning: errno:2 fread(): Length parameter must be greater than 0 /MYSITE.COM/htdocs/wp-admin/includes/class-pclzip.php on line 2672
 2012-10-31 09:53:24: Warning: errno:2 fread(): Length parameter must be greater than 0 /MYSITE.COM/htdocs/wp-admin/includes/class-pclzip.php on line 2672

Thank you, as always!

~ Corey