More than likely, you hit shift and delete by accident and trashed the file. It’s good to hear that you have a backup.
Deleted files aren’t really ever deleted unless you overwrite the data sectors. Windows deletes the reference from the directory and the data just waits to be rewritten with new information. Instant File Recovery will look for those sector records and recover the file from there.
Instant File Recovery is also good for basic data recovery if you have other corrupted partitions.