Best Way to Back up Music Library

[gnomus]

Fascinating. The preview I ran had the QNAP as the 'left' folder. If these files originated on the Synology (and I'm sure Simon is correct), then it is interesting that SyncToy clearly couldn't see them on the Synology, since it wanted to copy them back from the QNAP to the Synology.

If I were to 'echo' the Synology to the QNAP, would these files be deleted, or would I only end up with a new load of @ea directories, I wonder?

In terms of getting rid of them on the QNAP, is the best thing just to do a search for them using Windows Explorer, do a 'Select All' and then a 'Delete'?

[Edit: By the way there were over 14,000 of these @ea directories.]