This is a new problem. I was able to backup fine 5 days ago. There have been no changes to the server regarding the DB server or Apache. The server is running CentOS 6.6, opemEMR 4.2.
The program runs fine. PhpAdmin can find the DB.
Any ideas? BTW I did see the post regarding the similar problem in windows.
more details:
the script appears to execute. The following statements flash onto the screen:
“Dumping OpenEMR web directory tree”
“Backup file has been created. Will now send download.”
then the "Firefox can’t find the file at http://192.168.1.10/openemr/interface/main/backup.php."
A more likely relevant fact. Since the last backup the database has grown in substantially in size. In summary - I ran out of memory in the /tmp partition.