Free data in Free Software FCharts
8. Not worked on backfil yet. This is extract from their Help file-
Intraday Importing
You can also import intraday data via the 'Single Import' and 'Bulk Import' buttons. Just make sure the format is like this:
A first row with a header identifying the fields, eg: <TICKER>,<PER>,<DTYYYYMMDD>,<TIME>,<OPEN>,<HIGH>,<LOW>,<CLOSE>,<VOL>
Then the data:
TICKER, I, 20010720, 11:30, 0.135,0.135,0.135,0.135,50000
etc
I dont understand the meaning of <PER>. If somebody helps, backfill can be arranged.