How to avoid duplicates in My Cloud Home Duo?

[NoPlex]

@Ants

So, I deleted all duplicates (ca. 10.000 of 40.000 files) in the Backup folder and only kept the originals.
What happened next is that the iPhone My Cloud app tried to sync ALL files from iPhone to the Backup folder, creating duplicates again. This makes no sense - why does it not recognize that the files already exist in Backup? Of course, I checked whether the duplicates already exist on the iPhone but this is definitely not the case.

This thread may help:

App sync issue

WD MCH mobile app sync is just based on Syncthing, but without all the features opened to users. This ‘reset database’ is what Syncthing sometimes needs when it encounters an error, which may be what is happening. There is probably nothing a MCH user can do other than clear cache or reinstall the mobile app and/or delete sync folder on the MCH. Do a backup of the sync folder first of course if needed. 5.6. Troubleshooting Some times you may encounter database error and Syncthing will refuse…

App sync issue

Thank you so much for your help. I cleared cache, deleted data and started again and it took a few goes but is up to date now [Screenshot_20231117_071730_My Cloud Home]