Over the weekend I ran a sfc scan and also a check disk on the system. The backups have been successful for the last two evenings so i'm going to leave everything as it is at the moment.
If the backups start failing again I will try disabling Volume Shadow Copies as suggested in your post shreedhar.
The hotfixes suggested by Sandeshdubey appear to be for Windows server 2008 and i'm running SBS 2011 which i'm sure is based on Server 2008 R2 so i'm not too keen to install them fixes onto my system.
Thanks for your help and if anything changes I will report back.
KTBerwick
ASKER
My colleague opened this thread and clearly forgot to close it. I believe re-registering the VSS binaries resolved this.
https://www.experts-exchange.com/questions/27258101/SBS-Backup-Fail.html?anchorAnswerId=36547960#a36547960
Are there any thrid party backup application installed on the server?