I worked with backup with included transfer to amazon/s3 for a long time. After the last updates the transfer is not anymore available and having a look into the configuration shows that the fields for 'data processing engine' are not available as well! ALICE check ends with an error as well.
And it's not only on this installation - same situation with other joomla sites in the same hosting.
Thanks for your instructions to go forward!
Best regards
Heinz
PS
Upgrade of the PHP version from 5.5 to 5.6 would be available now.