It is recommended to take backup before any update or process in BUSY and then update BUSY release versions,as data upgrades to higher version.Further,any update in BUSY does not affect or lead to any data loss.But still if you have taken any latest backup before changes,you can restore that by not overwriting the existing data,so that you can chek your report formats side by side and can recover from backed up data or if any other data if required and same if you can restore report format like printing format,cutom formats if it has been backed up.