by Ken Task.
Mind describing what you are calling 'styles'?
In the mdl_course table, which would play a major part of a course backup, there is no column by that name and there appears no other tables in core moodle DB that use 'styles' in their names.
Is 'styles' related to some add-on plugin? That menutopic addon? BTW, shows compat up to version 3.10 of moodle.
https://moodle.org/plugins/format_menutopic/versions
'SoS', Ken