Data Older Than One Year
Data older than 1 year is only accessible on the Personal Pro web dashboard at this time. If you would like to access your old data, you can sign up for a Personal Pro account and view it via the web dashboard.
However, you can still export the old raw data from within the app if you want to calculate the HRV values outside of Elite HRV; you just won't have your score if you go that route.
If you want to see long term trends in your HRV, the Personal Pro dashboard is a great option. If you only want to examine single HRV readings, you can use the export function and import the raw data into Kubios, which is free for personal use and will generate your HRV scores for you. https://www.kubios.com/hrv-standard/