Hi Henry, :)
Thanks for posting this!Yes, you should be able to do that.
Details: So if I understand your question correctly (laying it out in detail - let me know if I misunderstood something please):
1 : You have a LIVE ONLINE site.
2 : You have a MAMP OFFLINE.
3 : You want to install BackupBuddy on the LIVE site.
4 : You want to install BackupBuddy on the MAMP OFFLINE for testing.
5 : You want to make a backup with BackupBuddy on the LIVE site.
6 : You want to then IMPORT/RESTORE/MIGRATE that backup to your MAMP OFFLINE.
7 : You want to work on that NEWLY MIGRATED WordPress on your MAMP OFFLINE.
8 : You then want to use BackupBuddy on your MAMP OFFLINE to make a backup.
9 : You then want to restore that backup onto your LIVE site.
If that's the case, then yes, you can use BackupBuddy on your local install and your live site and do transfers between the two.
Please do note, however, that because each server (LIVE site) and local install (XAMPP, MAMP, etc) are different, some extra configuration MAY be required to get BackupBuddy to work perfectly if there are any sourceserver/host/local restrictions or rules of any kind that may limit BackupBuddy's performance or features. If you run into ANY issues, the forums here will help you move forward in identifying the reason and working around it.
Support and Info: We have a LOT of tutorials and guides around and coming up too, regarding BackupBuddy.
A : Our forums, which you'll get access to, have a TON of information and a wealth of information and other case scenarios.
B : Our BackupBuddy Codex (
http://ithemes.com/codex/page/BackupBuddy ) is updated almost daily with tons of new and updated info.
C : We have many blog posts on the topic too and videos:
http://pluginbuddy.com/category/backupbuddy/ and MANY more planned and coming up.
D : Our WebDesign.com division has a full 1 hour video introduction to BackupBuddy also
http://university.webdesign.com/webinars-and-teleseminars/backupbuddy-basics/E : We have FREE webinars planned where Ronald Huereca (one of the main developers of BackupBuddy) and myself go through different aspects of BackupBuddy and answer questions LIVE. In fact, we had 2 such LIVE webinars last night and will post the video of the entire first webinar online on our blog soon.
So basically, once you buy BackupBuddy, you're in good hands! If you everget stuck, you will NOT be left alone and we will help you (whether it's someone else on the forums specific to BackupBuddy OR anyone else in the staff who knows the answer or next step also).
Please let me know if that answers your questions. We would LOVE to have you be part of the BackupBuddy elite! :)
Regards, and thanks again!