Backup Central

I am using backup for windows server 11.0 I am not able to backup systemstate. The error which I am getting is as follows:?

AOFO- Initialization failure on " System state". Advanced open file option used. Microsoft volume shadow copy services(vss) snapshot error. Out of disk spce, or could not find an NTFS volume while creating the snapshot. Microsoft volume shadow copy services requires an NTFS volume with at least 100MB of free space for each volume that will be snapped.

Could you please help me resolve this problem.

Have you checked your system drive (c:\ ) to verify you have at least 100 MB free space? If the drive is full (or almost full), the system state will not process properly.

-Dave