This is so specific to your own use case it's really hard to recommend something here. But I don't think it's a good idea to put the bundle into the cloud. Sure, you're dealing with bands, but you can't really control what bands are getting modified, and a band with a single file modified is a lot "bigger" than a file.
I think it'd be smarter to run your "cloud" backups directly from the Macs that you're backing up.
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--Dave Nanian
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