I've had the error below for the past few hours with this server, so I'm not sure why I'm looking for it. On the other hand, it's new and without changes on my side.
IO error encountered -- skipping file deletion
sent 53,383 bytes received 71,382,068 bytes 1,074,217.31 bytes/sec
total size is 33,497,468,215 speedup is 468.92
rsync error: some files/attrs were not transferred (see previous errors) (code 23) at main.c(1861) [generator=3.2.7]
23