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If you have enough hard drive space you should always create a restore point.
Power Point if crashes repair itself. It can say to restore the file that was lost by some reason.
Dont go to point where it crashes
Restore point
Restoring files on a hard drive can always be done as long as the hard drive itself isn't irrepairably damaged physically. If you are able to replace that hard drive with the hard drive in another computer and boot it up, you should be able to roll back the hard drive to a different restore point where everything was accessable.
Data recovery software enable a person to access and store data at any time. When you do this and your computer crashes it allows you to keep all your data up to the last restore point.
There is a thing called system restore which resets everything on you computer back to factory settings. Or you wipe your hard drive and reinstall your OS (operating system). Better option is to do system restore point which brings your system pretty much back in time to a point where you have not made those changes, but you have to create restore point at that time.
restore point restore point
For Windows PCs, this is a restore point. It can also be a program if you used a program to image your hard drive.
restore
If you goto the restore point section and create a restore point yourself, it should explained if and how long it is saved. You are probably better to use the "backup" tools
If you are using a standard Windows operating system, you would use the "System Restore" function found in the start menu under Accesories>System Tools if you are in windows 7. for Mac, you will have a System Restore CD, follow it's instructions. For a Linux Operating System, it will most likely not have any such function, requiring you to fix the problem yourself.