The Tempdrop sensor can store up to 24 hours of recorded data which is average 3 nights of 8 hours.
The data is erased only after it’s uploaded by syncing. If you don’t sync Tempdrop for more than 3 nights and record more than 24 hours, your data will start to be recorded over and deleted. We recommend syncing daily as a best practice unless you are out of internet range and it's necessary to use your Tempdrop for 2-3 nights.
All of your temp history is stored on the server rather than on your phone. If you swap phones, you won't lose your results.