Ask HN: How do you sync/put files with/on your Android Device?

It's been a question for a longer time now for me what's the easiest and/or most elegant way to synchronize files with my Android Devices.

For smaller files (and up to 50mb) which I need on my Smartphone as well as on my Tablet, I use dropbox, since it's "fast" (in the meaning that I only need c&p files into my dropbox on pc) and comfortable. The downside is that I'm not the cloud-guy, I'd rather keep my files secret. I also don't like the delay (first upload it, then sync my mobile dropbox, then save it on sdcard).

For bigger files or stuff which I only need on one device, I use FTP Server/Client apps. It's a very fast transmission and things are right in their place on sd card. The downside is that I have to make several steps before: check if my devices are in my wifi network (I usually turn wifi off), open ftp app, activate ftp, open ftp app on pc, drag&drop files.

I'm still looking for an easier way, i.e. syncing folders/single files on my pc with one of my Android devices (supposing they're in my network already) with less steps.

What's your way, HN?