Bit of a Veeam backup issue fest tonight.
Came across the error below today in Veeam 7.
Error: VSSControl: -2147467259 Backup job failed.
Cannot create a shadow copy of the volumes containing writer's data.
VSS asynchronous operation is not completed. Operation: [Shadow copies commit]. Code: [0x8004231f].
This error normally relates to low disk space. Sort out your disk space on the affected VM and then you should be good to go. A server can need a couple of GB’s to do its shadow copies.
Once you have freed up enough disk space check the status of the vss writers.
Open an elevated command prompt. Then run
vssadmin list writers
If you see any shown with a failed status like as shown above then restart the server. If they are all stable with no errors then try the backup again.