When you are getting RT quotes using 'Nest RTD',
this utility does not have option for backfill ??
Anyway, open DataTable, copy it to excel and save it as .csv file, now clean it of extra/unwanted quotes (rows) and edit/format as per columns required by you and use it for backfill.
For subsequent days, copy data what you want, of that day and add/paste it to original csv file.
Yeah, its a bit tedious and time consuming, but as I said its only a jugaad.