The @eaDir directories contain extended attributes and thumbnails that take up quite a bit of space, not unlike Windows Thumbs.db files.
Here’s how to get rid of them easily from the command line.
First, SSH into your Synology NAS box and log in as root, then type this to locate the @eaDir folders:
find . -name "@eaDir" -type d | more
If you’re happy you’re not going to accidentally delete something important, then make it happen:
find . -name "@eaDir" -type d -print0 | xargs -0 rm -rf
Note that after deleting the directories, you may also want to disable the services that created them.
Do you have any feedback on the above? Please leave it in the comments section below. Thank you!