"For those not familiar: there is a difference between backfill and historical backfill. The former is an update of missing quotes for the current day and 5 days back. I think it is a full T&S refill, without B/A quotes.
A historical backfill gives OHLC's per day for the past year-to-date."
that MAY be true for IB *historical backfill*
with my historical backfill provider, i can get many many many more years of backfill (OHLC for each day) than just the year to date.
which, for me, is essential.
year to date is nowhere near enough ime
i gotta use this space to give props to QT again. it r00ls