Synology creates directories at the most random places called @eaDir. They are very useful in case you have for example photos in your directory, as Synology keeps metadata and thumbnails all inside this @eaDir folder.

Nevertheless, every now and then you want to remove all those @eaDir directories. That’s very well possible. Login through SSH, cd to your folder, and execute the following to find all @eaDir folders somewhere in the current directory or any of its subfolders, and delete those @eaDir directories:

find . -name "@eaDir" -type d -prune -exec rm -rf {} \;