No,overwriting can occur even if data restored is to different drive but same hdd(C,D,E etc are for human convenience,it does not mean actual data on hdd is enclosed in areas named C,D,E.Technically it is much more complex & that's why data recovery recommended practice is to not write anything to hdd from where data is to be recovered). That is why people attempting data recovery make exact sector-by-sector copy which is exactly equal to hdd size instead of using normal image of hdd which is compressed by nature & is always smaller than hdd to be imaged.
Few questions-
1. Fine the folder deleted yesterday has been overwritten. So, why are the folders, files deleted months ago still shown in the scan? I didn't bother to check their health whether they can be recovered or not. Yesterday's folder has vanished from the scan/search list also.
2. Will be saving important folders/files in d,e etc. drives and will keep a shortcut on desktop, along with regular backups. How and should I enable a proper backup/shadow image thing so that I am not screwed next time?
Finally is there any way to recover files from that shadow backup or to make the excel files correct i.e. non-corrupted? Partial recovery would also do.