Files maybe not lost at all after delete.
So you may choose free data recovery software to recover deleted files by your self.
If the users mistakenly remove the files (shift + delete or empty the recycle bin or, delete the files while cleaning viruses) and the file system is Fat32, Exfat or Ntfs, they can scan and recover the files using the “Undelete” function. This data recovery software’s undelete-scanning is very fast and with strong functions. Also can scan many files by file type.