i don’t know if it is possible to filter at backend without one of this:
- a additional field that contains the “count”
- a save date_time-field
- any other (own) field that you can order by
where you can order by ASC/DESC
if you have one of this field, than you can use this how-to to order your repeater
if it is only for frontend: than it is no need for such a field. just use something like this
$reversed = array_reverse($your_repeater);