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  • Do you need M to be standalone? If not then probably a union mount of some sort will do. Commented Feb 18, 2020 at 7:33
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    Your last rsync command worked for me (in a very small test) with the order of sources determining which file is copied over, regardless of date. It shouldn't be skipping newer destination files unless you were using the -u flag anyway... Commented Feb 18, 2020 at 19:58
  • Hmm yeah, that was an editing error; I had been using --update but realised --checksum would be better given I want deletion of files in U to work properly. Commented Feb 21, 2020 at 8:26
  • There was a file that was consistently being copied from B instead of U when I used --update, but now (after pulling some changes to the files I was copying), the issue disappeared? That's dissatisfying to say. All the files from U are being preferred now, even when I use --update, and I can't reproduce the original issue. Commented Feb 21, 2020 at 8:27