The solution to the Windows backup failure error code 0x807800c5 is as follows: 1. Ensure that the backup target disk space is sufficient. It is recommended to free up a few GB of space or try a small-scale backup; 2. Check whether the target disk format is NTFS, otherwise the data needs to be backed up and formatted to NTFS; 3. Restart the volume shadow copy service (VSS), run the commands net stop vss, net stop swprv, net start vss, net start swprv, or use sfc /scannow to scan system files; 4. Close third-party security software to eliminate interference, and add exception rules if necessary. Following the above steps to troubleshoot this problem can usually be solved.

Windows backup failure error code 0x807800c5 usually occurs when you try to use the backup and restore functions that come with Windows. This problem will interrupt the backup process, causing the system to fail to save your files, settings or system status normally. There may be multiple reasons for this error, but fortunately, it can be solved in most cases.

Below are some common reasons and corresponding solutions to help you troubleshoot and solve problems.

1. Check whether the backup target disk space is sufficient

One of the most common reasons is insufficient space for backup target disks . Windows requires a certain temporary space to create image files when making backups. Even if the final backup file does not exceed disk capacity, it may fail due to space requirements for the intermediate process.

Recommended operations:

• Confirm that the backup path you selected (such as external hard drives, network drives) has enough free space.
• Delete some old backup files or unimportant data to free up at least a few GB of space.
• If you are using a network drive, make sure the connection is stable and the permissions are correct.

If you are not sure how much space you need, you can try a "small-scale" backup first (such as selecting only a few folders) to see if it can be completed normally.

2. Check whether the backup target disk format is compatible

The Windows backup tool has certain requirements for the file system of the target disk. If the disk you are using is exFAT or other non-NTFS format, you may get the 0x807800c5 error.

Recommended operations:

• Right-click Backup target disk → Properties → View the "File System" type.
• If it is not NTFS, it is recommended to back up important data on disk and format it as NTFS.

?? Note: Format will clear all contents of the disk, please prepare in advance.

3. Update or reinstall the Volume Shadow Copy Service (VSS)

Volume Shadow Copy Service is one of the core components of the Windows backup mechanism. If there is a problem with VSS, the backup will fail.

You can try the following steps:

• Open a command prompt (administrator)
• Run the following commands in turn:

 net stop vss
net stop swprv
net start vss
net start swprv

This will restart the related services and sometimes fix temporary failures.

If that doesn't work, you can try manually resetting the VSS provider, or run it through the system file checking tool:

 sfc /scannow

4. Check for third-party security software interference

Some antivirus software or firewalls may block the backup process of Windows, especially when accessing system files or writing to external devices.

Suggested practices:

• Temporarily turn off third-party security software (including real-time protection functions)
• Try to execute the backup task again

If the problem disappears after closing, it means the conflict is from the software. You can consider adding an exception rule, or changing a more compatible backup method.

Basically, these common causes and solutions are all there. If you encounter 0x807800c5, don’t be too nervous. Most of the time, it is a disk space or format problem, or a VSS service exception. Follow the above method to check step by step and it should be done.

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