Being a database developer, you are using MS Access to create several databases containing distinct data items like tables, triggers, procedures, etc. On the other hand, you are using MS PowerPoint for creating distinct PPT presentations regarding database creation. Both type of files, you have saved on your local computer.
You have taken back up of those files on your iPhone. Suppose your original data get damaged, when you moved to backed up files, you have seen that these files are also corrupted. To rescue data from iPhone, you need to use some professional solution like Hard Drive data recovery to rescue NTFS data files accurately.