10.13 feels like an alpha a bit, maybe 10.13.1 will feel like a beta..
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TM won't work on APFS even if the drive is an SSD. I lost my TM data testing this theory out and had to start from scratch back to a HFS format.Well, I have two ThunderBay 4s running SoftRAID (RAID 5), one for work and media and the other for Time Machine. All are formatted HFS. The only APFS volume I use is my startup SSD. It backs up to Time Machine just fine. I also use Carbon Copy Cloner to clone my APFS startup volume to an external HFS volume and that works fine as well.