Take reference to the link below. There is a work around for some related issues. Windows backup or restore errors 0x80070001, 0x81000037, or 0x80070003 Quoted from Microsoft:
"These issues occur because the folders or libraries that you are trying to back up or restore include a reparse point. Reparse points resemble Windows shortcuts or to Unix symbolic links. A reparse point may be used to point to a file that is temporarily relocated on a different drive. For example, a reparse point would allow a folder such as C:\DVD to point to Drive E, the actual DVD drive."
I also found when having failures to back up a system, there can be some corrupted files in the cache or temp areas dealing with programs that were not shut down properly, or during a re-start the files were not properly closed, or files that were being written to at the shut down time and the FAT and or the directory tables were not properly updated.
A fix that often works is to use CHKDKS /R
Go to the system prompt by clicking on Start, and then Run. Type in CMD and press OK to get to the system window. Then use CHKDSK /R. The computer will have to be re-started to do this operation. This checkdisk command could take a long time to complete. You will need administration rights for this to work.
I also had failures with Windows 7 backup where the fault was on the destination hard disk. If the destination hard disk was not defective the solution was to back up any valuable files that are on it, and then re-format that drive. Remember, the format has to be in NTFS. Before doing a reformat of the destination disk, you can also try running CHKDSK /R on it. I generally reformat it.