How to back up non-system drives?

[BobKrist]

Dave: Been using SuperDuper to back up my main system drive in my Mac for years, but I've searched and can't find an answer to just using it to keep data on non-system drives synced with each other.

I run three Drobos with identical data, but one stays off-premises for months at a time and when I bring it in to update, I'd like to be able to do it quickly.

But I don't want to make it bootable or any of those other options that pop up for backing up my main drive.

What is the prescribed way to do this? Thanks! Bob Krist

[dnanian]

The same way as a regular copy - use "Backup - all files" with "Smart Update". The drive doesn't have to be bootable...

[BobKrist]

Dave: Will "Smart Update" work if I've been previously backing up those Drobos manually by dragging folders etc. (I know, primitive, but what can I tell you?). Thanks, Bob

[dnanian]

It'll work, but if the data doesn't match it'll end up copying stuff again.