Hi,
The log show that there is a problem with the BCD file used by Windows to boot so we need to recreate it, do you have a Windows 10 DVD/ flash drive that can be used to boot the computer?
If not please access the Microsoft web page https://www.microsof...nload/windows10 but this time download the Media Creation Tool and create a DVD or flash drive containing Windows 10.
Let me know if you have problems doing this.
For the backup if you want a "manual" tool to help doing the backup that only copy files/folders that have changed and show all the changes before doing it I use FreeFileSync https://freefilesync.org/