Norgate Premium and EOD data reliability

Hi All
I currently use Norgate Premium Data for ASX and world indicies.
This service is trouble free and I am loath to change suppliers but I am interested in the EODDATA Silver subscription as it has additional markets.
The data is in Metastock format that I use with Amibroker and Advanced GET.
I have historical data in the Metastock format and I would like to know the EODDATA will simply append to my current data so I can retain my historical data.
Any other information about EODDATA would be appreciated.