Hello. I have deleted my save data 3 times by kaspersky. At first, it is better to change the threat rule of Kaspersky to safe category that I think.
Then, if you still have backup save data like ".nimbSave_backup", you can recovery by rename it to ".nimbSave" . Of course you would better to copy ".nimbSave_backup" file before it to be deleted by Kaspersky.
Have a nice drone launch !