back up -- nandroid hellllppp

hello so iv got no rom or a bk up that will boot cant get phone to connect to laptop so cant do nothing through usb,lead all my option is is to get a bk,up transfer to micro sd card with a sd card adapter place it in twrp back up and restore it,but cant get a fastboot getvar as no connection ,as fair as i know it is on ee and was bought in the uk or maybe factory unlocked ,,has anyone got a bk,up i can give a go pleases ,,wot a situation to b in