This was the answer to a question about changing the date of the backup file created.
As well as line 61, the same code appears on lines 77 and again on line 81.
I am not sure what these relate too, but do these need to be changed too?
Also, what is the purpose of these lines (211/212) in backup_zc.php
Code:
//Default file name format.
$backup_obj->fname_format = 'm_d_Y';
Thanks