I got this problem too, after doing some search I know it’s probably because PHP has deprecated funtction split() since PHP 5.3, so if your host installed PHP 5.3 or later you may get this problem. I also find that split() can be replaced by explode(), but strange enough, after I’ve changed from split to explode in wp backup’s source code, I still get this errror, and I still can’t send the backup file. Hope you get lucky!
I tried again and deleted the old backup files(last time I didn’t), and it works fine now.
I have reinstalled but it’s the same, maybe I should go back to the previous version, do you still have the zip file for previous version? Thank you!
