Hi Moez Lamti,
I am afraid you need to find someone professional to help you access files on home computer, if there is no problem with the hard disk, just the operating system crashes.
Unless you set the OneDrive sync folder on your computer as AutoRecover file location, which is an option in Word > File > Save, Word would not create related temporary files online.
Besides, to make an online backup copy, you need to go to File > Option > Advanced > Save, check the box of "Always create backup copy" first, then save files in OneDrive sync folder and modify the files. Then a backup file of .wbk format will be generated on the same storage location, they would be synced to OneDrive cloud when OneDrive is working normally.