I am using a 2TB usb 3.0 drive to backup my data drive and keep getting eh error "Failed" "Volume is too small to accommodate restore point metadata. Please ensure that on volume included in backup is at least 512mb in size".

The data drive has over 22gb of data on it.

I have no idea what the problem is, can anyone help

Hi,

Please check if there is enough shadow copy storage space available on the dirve. The size of the storage area that you choose will determine how many versions of changed files you can store. 

For more detailed information, please see:

Rapid Recovery with the Volume Shadow Copy Service
http://technet.microsoft.com/en-us/magazine/2006.01.rapidrecovery.aspx

Best Regards,

Mandy