Laravel backpack clone button. (resources/views/vendor/backpack/crud/buttons/custom/clone.blade.php)

clone.blade.php

@if ($crud->hasAccess('create'))

    @php($parameters = [])
    @php($attributes = collect($entry->getAttributes()))
    @foreach($crud->getFields('create') as $field)
        @if($attributes->has($field['name']))
            @php($parameters[$field['name']] = $attributes->get($field['name']))
        @endif
    @endforeach

    <a href="{{ url($crud->route.'/create') . '?' . http_build_query($parameters) }}" class="btn btn-xs btn-default">
        <i class="fa fa-clone"></i> {{ trans('backpack::crud.clone') }}
    </a>
@endif