I see others are thinking about the same questions. I've been hearing mixed reports about APFS, but as pointed out it's not yet finished. I gather it will save a lot of drive space and also make file copying lightning fast, so in theory daily backups with SuperDuper! might be complete in a matter of seconds.
One area I'm unsure about is how the new format will behave on SATA drives, since I gather it's being aimed primarily at SSD.
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