Freeing up backup space

Hello everybody,

I am trying to free up space on my backup storage. I have a bunch of *.tar.dat files and *.tmp folders in the backup destination. There are also many tar.lzo files.

I'm thinking I can delete the .tar.dat files and the .tmp folders. Looking at the dates and VMID's on them I think they're unsuccessful backups that just never got deleted. Is this a safe assumption?

Thanks!