Using Automated backup I continue to receive errors

Summary
==================================================
Courses: 15
OK: 7
Skipped: 3
Error: 0
Unfinished: 5

Some of your courses weren't saved!!

As you can see some courses save OK and others are Skipped and 3 are unfinished.

The errors look like this

Course Time taken Status Next backup
ASHS VLE 3 Jul, 06:01 - 3 Jul, 06:01 OK 4 Jul, 06:00
GCSE ICT Unit 1 3 Jul, 07:41 - 4 May, 22:53 Unfinished 5 May, 18:00
Student Council 3 Jul, 09:16 - 4 May, 22:52 Unfinished 5 May, 18:00
Staff Room 5 May, 18:21 - 5 May, 18:21 Skipped 6 May, 06:00
Resources 3 Jul, 02:51 - 4 May, 22:52 Error 5 May, 18:00
GCSE ICT Chap 1 5 May, 18:26 - 5 May, 18:26 Skipped 6 May, 06:00
GCSE ICT Unit 2 3 Jul, 04:26 - 4 May, 22:52 Error 5 May, 18:00
Functional Skil 3 Jul, 06:01 - 3 Jul, 06:01 OK 4 Jul, 06:00
Yr11 ICT Group 1 Jan, 00:00 - 1 Jan, 00:00 Skipped 1 Jan, 00:00
Year 7 3 Jul, 06:01 - 3 Jul, 06:01 OK 4 Jul, 06:00
Year 8 ICT 3 Jul, 06:01 - 3 Jul, 06:02 OK 4 Jul, 06:00
Year 9 ICT 3 Jul, 06:02 - 3 Jul, 06:02 OK 4 Jul, 06:00
GCSE French 3 Jul, 06:02 - 1 Jan, 00:00 Error 1 Jan, 00:00
GCSE German 3 Jul, 07:36 - 3 Jul, 07:36 OK 4 Jul, 06:00
GCSE Maths 3 Jul, 07:36 - 3 Jul, 07:36 OK 4 Jul, 06:00

If I try to look at the detailed backup logs for any course I get the message

Detailed execution log
Course: ASHS VLE
No logs have been found