Yes, Terra does support historical backfills. To perform this, you would need to make a http request to our REST api (to the endopoint for the data type you wish to retrieve), for example:
This will request and send the data to your webhook in chunks This method requires a webhook (or other destination) to be configured as the response may be too big for a HTTP request. Whilst this is feasible, it is not advised practice as this will slow down delivery of events to your webhook. Some providers do not allow historical backfill past a certain point (Polar, Garmin, Samsung) and other have strict ratelimits which will result in a longer period before the request is fulfilled.