Go to Backup, Archive, and Restore (second option from the top) - set the client you are willing to list files for, select the desired date (start/end date) and browse for files...
From CLI it would be the command bplist or bpflist - here is an example use
I recommend using the CLI for this
The commands behave in a special way, you need to know, else you will get the dreaded "no files found"
I have described some of the "things always to include on the command line" in the above blog post