I have a Mac Pro 5,1 running Mojave 10.14.6 connected over ethernet that I'm using to share a disk for my two laptops to use as Time Capsule. My 11" MBA (2015) running Mojave 10.14.6 - no problem. I pointed time machine to the shared disk and in less than 12 hours it completed a sparsebundle backup. My 13" MBA (2010) running High Sierra 10.13.6 has been trying to complete a backup for the past 3 days. It copies about half the data and then stops. It had copied over 75GB out of 187GB before it stopped. I restart the backup at this point, then it labors. the fans come on, it copies just a few MBs, then it stops again. Anything I may be doing wrong? I have set both computers not to sleep during this first backup just to make sure nothing went wrong. Any helps greatly appreciated.