rsync: File name too long (36) when moving data towards Synology NAS

Likely this is because your filenames are too long, over 255 bytes. However, if you have enabled encryption on your shares in Synology, that limit is lowered to 143 bytes, which is much easier to hit. Longer explanation eCryptfs, which Synology uses for encrypted shares, must keep encrypted filenames within the underlying filesystem’s 255-byte limit, [ ]