How to fix
Windows backup error 0x80070001
on Windows

Hello. I have a problem with my automatic backup. Since it is set to occur automatically, I receive an 0x80070001 error each time it is triggered. I am not sure how to resolve this. Any ideas? Thanks in advance.

There are many reasons why data on a hard drive or solid-state drive could be lost - physical damage, hardware or software failures, theft, malware[ref en-3] infection, and more. This is why backups are extremely important for everyone who has valuable documents, pictures, databases, or other files located on their computer for various purposes.

There are plenty of choices when it comes to how backups are implemented and maintained. Automatic backups can be especially useful, as they do not require constant efforts of redoing them every now and again. Copies of data can also be stored on physical devices that are not connected to the computer directly, it includes USB thumb drives, external HDDs, NAS[ref en-1] devices, and much more.

Most people resort to automatic backups, and Windows offers a few options, even though they are pretty limited. File History is one of the built-in features that save files in Favorites, Contacts, and other folders. During one of the backup attempts, some users might experience a 0x80070001 backup error, which prevents them from successfully creating copies of their files, leaving them out of date.

Likewise, users also reported receiving the error when trying to restore Windows to its previous state using an automated backup system. This feature is useful when something goes wrong and people can restore the system into a state it used to be before the problem existed. With 0x80070001 error, users can no longer achieve that.

There is plenty of similar backup errors we talked about previously (0x81000036, 0x80070003, or 0x81000037), and each of them has its own reasons for occurring. In this case, 0x80070001 called for the "Invalid function", which means that the reparse point points to a volume that uses the FAT file system.[ref en-2]

To fix this error, you have to access the elevated Command Prompt and perform a set of commands as we explain in detail below.

Fix 1. Remove the reparse point

The main fix for the error is to remove the reparse point from the library, which would then solve it after running the backup once again. In order to do that, you need to open elevated Command Prompt as follows:

• Type in cmd in Windows search
• Right-click on Command Prompt and select Run as administrator
  (In Windows 7, XP, or Vista, click on Start and then go to All Programs > Accessories and select Command Prompt)
• When User Account Control shows up, click Yes
• In the new window, type in the following command and press Enter:
  DIR /AL /S

  

• A reparse point would be shown at this point - your job is to delete mounted volume reparse point
• Locate the reparse point you have found (navigate through File Explorer), right-click and select Properties
• In the General tab, make sure that the volume type is Mounted Volume
• Close down Properties and delete the folder.

Fix 2. Check for damaged system files

Damaged system files may also cause backup errors, so you should make sure that Windows image and system files' integrity is fine:

• Open Command Prompt as Administrator as explained above
• Paste the following command and press Enter:
  sfc /scannow
• Wait till the scan is finished
• Once done, proceed with the following command (don't forget to press Enter):
  dism /online /cleanup-image /restorehealth

  

• Restart your PC.

Additional tips

If you are frequently encountering errors, crashes, and other issues on Windows, we strongly recommend you run a scan with [d1] PC repair and maintenance tool. It can remove already installed malware from the system if such exists, and repair all the damaged files without having to reinstall Windows, which saves a lot of time.

Likewise, the app can also take care of various caches automatically without you having to clean them manually in browsers or other locations.