Is Nonstop Backup completely useless?

NSB has pretty much been stopped since the initial backup. Now I need that backup as a drive has failed,
The initial backup was created in Feb, with either 2013 or 2014, and I am now on 2015.

I have a cdp.metadata file and all of the cdp.data files, but the tin file is 0 length.

If i try to recover , it tells me that the archive is corrupt. If I try recovery from the boot disc, selecting the tib file or image,data gives a corrupt archive error, selecting the cdp.metadata file tells me that it is the not the last volume of the archive.

Can anything be done or do I have 700GB of useless files?