teashaw

the lazy-load function was actually working quite well, seems I need to use an alternative plugin.

Same issue here. I have exactly the same problem and modified the wp-config.php file as requested, but now when I do a manual back it opens a new link (blank page) to /wp-cron.php?_nonce=3c6da2d15b&jobid=4&backwpup_run=runnowalt

This workaround is perfect, works for me!