phred, please compare timings of baseline backup and 2 subsequent incremental backups of 11-13-5 version and these 2 versions for your library (for inc. backups the number of changed tracks should be large enough (~500-1000), i want to choose more fast version:
Here are the results of my testing...
2016-11-13-5
Initial backup of my 19,000+ track library took about 40 minutes
Auto backup after comments tag was changed in 762 tracks took about 50 minutes
2016-11-14-1
Auto backup took about 45 minutes with 762 tracks changed
New baseline took about 50 minutes
2016-11-14-2
Auto backup took 37 minutes with 762 tracks changed
New baseline took about 15 minutes