I had the same problem with 1.6.2
After updating to 1.6.3 it became worse. I now get:
Warning: file_exists() [function.file-exists]: open_basedir restriction in effect. File(/usr/local/bin/mysqldump) is not within the allowed path(s): (/home/domain/:/tmp:/var/tmp:/usr/local/lib/php/) in /home/domain/domains/domain.com/public_html/main/wp-content/plugins/backupwordpress/hm-backup/hm-backup.php on line 714
Warning: file_exists() [function.file-exists]: open_basedir restriction in effect. File(/usr/local/mysql/bin/mysqldump) is not within the allowed path(s): (/home/domain/:/tmp:/var/tmp:/usr/local/lib/php/) in /home/domain/domains/domain.com/public_html/main/wp-content/plugins/backupwordpress/hm-backup/hm-backup.php on line 714
Warning: file_exists() [function.file-exists]: open_basedir restriction in effect. File(/usr/mysql/bin/mysqldump) is not within the allowed path(s): (/home/domain/:/tmp:/var/tmp:/usr/local/lib/php/) in /home/domain/domains/domain.com/public_html/main/wp-content/plugins/backupwordpress/hm-backup/hm-backup.php on line 714
Warning: file_exists() [function.file-exists]: open_basedir restriction in effect. File(/usr/bin/mysqldump) is not within the allowed path(s): (/home/domain/:/tmp:/var/tmp:/usr/local/lib/php/) in /home/domain/domains/domain.com/public_html/main/wp-content/plugins/backupwordpress/hm-backup/hm-backup.php on line 714
Warning: file_exists() [function.file-exists]: open_basedir restriction in effect. File(/opt/local/lib/mysql6/bin/mysqldump) is not within the allowed path(s): (/home/domain/:/tmp:/var/tmp:/usr/local/lib/php/) in /home/domain/domains/domain.com/public_html/main/wp-content/plugins/backupwordpress/hm-backup/hm-backup.php on line 714
Warning: file_exists() [function.file-exists]: open_basedir restriction in effect. File(/opt/local/lib/mysql5/bin/mysqldump) is not within the allowed path(s): (/home/domain/:/tmp:/var/tmp:/usr/local/lib/php/) in /home/domain/domains/domain.com/public_html/main/wp-content/plugins/backupwordpress/hm-backup/hm-backup.php on line 714
Warning: file_exists() [function.file-exists]: open_basedir restriction in effect. File(/opt/local/lib/mysql4/bin/mysqldump) is not within the allowed path(s): (/home/domain/:/tmp:/var/tmp:/usr/local/lib/php/) in /home/domain/domains/domain.com/public_html/main/wp-content/plugins/backupwordpress/hm-backup/hm-backup.php on line 714
1
? Automatic backups are disabled.