Are Rsnapshot backups self contained - how to save into zip?

I have some old backups done by rsnapshot . The directories are:

/backups/week.0
/backups/week.1
/backups/week.2
/backups/week.3
/backups/week.4

I'd like to keep only one copy and delete the others. Since the backups are incremental, will it work if I zipped week.0 into week.0.zipand deleted everything else?