E way bill

1 As per Notification 12/2018 CT Yes you are correct If the transporter is within state & within 50km , No eway required to send your consignment to Transporter Place (Only A part Shall be fill) but for further delivery from Transporter place to Recepient place the Eway Bill is mandatory (Either transporter or supplier should Genrate)

2. No you cannot generate back date Eway Bill & cant even generate today for bill raised in aug or sept ,its valid upto 15days if the Goods is with Transporter