https://www.itefix.no/i2/cwrsync

cwrsync installs easily and has worked well for me. I'm pretty sure it was free when I last used it (some 7 or 8 years ago at least) but appears they want to charge for the server version now.
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Christian
#40104192 120Gb (no longer in my E36 M3, won't fit the E46 M3)