After failing on various tools to keep the necessary files synced over the different devices me and my family are using, I am nowadays the happy customer of AllWay Sync, which provides both automatic and manual sync opportunities, and powerful filters that are useful for e.g. excluding those thumbnails and other app or OS-dependent database files from the automated syncs. It also keeps nice log files so you can follow what is happening and where in your networks. Lately, I have noticed that video and photo files still figure in the logs in their usual style, but music folders only occasionally sync the album cover files (subject to updates in different music clients). This is due to the Spotify Premium account: there is no longer need to get CDs or do mp3 file downloads – pretty much all music I have time for is there, and then there are also all those (net) radios and podcasts. Times are a-changing..