if yer on windows the bestest sync tool is Create Synchronicity

Create Synchronicity is a powerful and lightweight open source backup and synchronization program, available in many languages.

Create Synchronicity is especially light: zipped, it weights about 220 kB (that's 15 times less than an average MP3 file). It makes backing up your files extremely easy, while remainining fully customizable.

CS is faster than any other sync tool, it took only a few minutes to sync 860 GB of mp3s.

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