Via the UI you can request a export of all of your data
Is there a way to do this via the API without just looping over all the data, Don’t want to cause extra load
Hi Simon,
Welcome to our API forum! 
My name is Katie, I’m one of the Support Engineers here at FreeAgent.
Unfortunately this isn’t currently possible using the API. Due to the amount of time it can take to generate and export a company’s data, we use a background job to run this process within the UI. This isn’t possible to do via the API, and we currently don’t have a way to stream that amount of data or a file of that size over the API either.
I’ll raise this as a feature request so that this can be reviewed by the relevant team to see if it’s something we will look into implementing. However, I anticipate that this feature would take a lot of work to implement, so it could be unlikely for us to go forward with it.
If you have any other questions about this, please don’t hesitate to ask.
Katie