What will happen to my existing Peachtree company after I install the upgrade? Your data will be converted to the new Peachtree Accounting format the first time you open your company. Once you convert your company to the new release, you cannot use your data with any prior releases of Peachtree Accounting. For that reason, we strongly suggest that you back up your data to diskettes before converting your company files. For more information, see the next chapter in this guide, see “Upgrading from Previous Versions” on page 29.