The backup copy job does not just copy, backup files, this feature creates a separate backup chain and copy most recent state of VMs from the source repository.
You can enable GFS retention
in the backup copy job and configure it to keep weekly backups
on Wednesday and retain as many as you need, also it is important to enable active full (select the “Read the entire restore point from source…” check box).
So if I outstood it right, I doesn't have any chance to ignore the incremenatal backups?
There is a possible workaround for you to use file copy job