Backups vs Legacy Backups? Why does backups warn you about legacy?

I am trying to determine if somehow I need the "current' backup option in WHMCS turned on as well as the "legacy" backup system? The reason I ask is I used to use the legacy backup system when it was the primary backup. So I noticed the new backup system, turned it on, and then disabled the legacy one. Well when I do that, upon going into the Backup Configuration it pops up at the top and warns me that "The legacy backup system is currently disabled. Click here to manage the legacy backup system."

Which takes me to the legacy system... it makes me think that both should be installed for a truly comprehensive backup? I'd imagine not though...

Can anyone shed some light?

Thanks,
Tim