Sadly Backup and Sync is a buggy mess for me on MacOS. I have one picture apparently that keeps the app spinning and trying to upload but never does. It doesn't fail either. It just keeps spinning.
Of course there is no log for me to see which photo the culprit might be (and hence reencode it or move it out from that photo folder)
Unfortunately besides millions of lines of continuous
log_decorator.pyo:137 Entering in DoesAutoLaunch().
log_decorator.pyo:137 Returning from DoesAutoLaunch().
there is nothing indicating why the batch process starts and immediately quits and then restarts again.
Fun
At least I can delete the 240MB log file now while I search for another service that lets me backup my 75GBs of photos and displays them neatly on an iPad/iPhone.
Yep. I have left mine running for literally weeks (over 25/5 DSL, so not a screaming connection, but perfectly adequate before) and it has not finished syncing a library that was completely synced before. It should be just a metadata update, but somehow it found tens of thousands of photos and videos and is constantly falling over some big movie or Pentax raw file and dying. Total piece of crap.