Missing function "ftp_login" in BackWPup

Hi,

I wanted to run another backup last week using BackWPup, but noticed it was not working. Checking stuff, I found that in the job settings, the option to upload to ftp was disabled due to “Missing function “ftp_login””. Obviously I did not change anything between the last backup half way december and now, so where on earth is this coming from? I have no clue even where to start looking for the ftp_login function. Google was no real help either. I upgraded to WP 3.8 from 3.7.1 but the problem still is there.

Please advice.

Best regards, Peter