I have the problem with several sites with different server-configurations:
One Site:
WordPress version 4.9.6
BackWPup version 3.5.1
PHP version 7.0.30-he.0 (64bit)
MySQL version 5.6.37-82.2-log
cURL version 7.38.0
cURL SSL version OpenSSL/1.0.1t
Server Apache
Operating System Linux
PHP SAPI apache2handler
Maximum execution time 30 seconds
BackWPup maximum script execution time 30 seconds
PHP Memory limit 256M
WP memory limit 256M
WP maximum memory limit 256M
Memory in use 46.00 MB
This is a Test-Site were only a few plugins are installed with nearly not content and structure
Other Site (other provider):
WordPress version 4.9.6
BackWPup version 3.5.1
PHP version 7.0.10 (64bit)
MySQL version 5.5.52-MariaDB
cURL version 7.19.7
cURL SSL version NSS/3.27.1
Server Apache/2.2.15 (Red Hat)
Operating System Linux
PHP SAPI cgi-fcgi
Maximum execution time 30 seconds
BackWPup maximum script execution time 30 seconds
PHP Memory limit 256M
WP memory limit 40M
WP maximum memory limit 256M
Memory in use 10.00 MB
That’ s production site with several plugins and with content
I does not work either if I save it to ftp or if I save it to file. I also get no error messages and it also worked with the older versions of BackWPup.