Right now, zetaback archives are a one-way street. Once a backup has been archived, it "disappears" from zetaback's view. The only way to examine what's in the archive is to look at the filesystem. However, the on-disk files have the dataset name base64-encoded, so it's not immediately obvious without some shell trickery to see what you've got.
I propose that we add a summary option to view archived backups, with the same simple/expanded choice as one currently has for viewing active backups. I choose to extend the '-s' option only, since the information from '-l' is (IMHO) too minimal for the archive exploration case.
Use case:
- '-sa' to view a list of archives with timestamp, type and size (same output as '-s')
- '-sax' to view an expanded list of archives, similar to '-sx'
