Flagging to close crap for being crap (at the moment you're still under the line for SO) earns you flag-rep for your Marshal hunt. Once you cross 3K though, they're turned to close votes and don't count for flag-rep.
If the question is just about how to use rsync, SU or Unix & Linux are better homes. U&L is good if they mention a specific distro in the question or tags.
Dev-server and home-server usage are specifically off-topic here.
When coming from SO, assume it's a dev-server unless it is clear it isn't for some reason. Dev-server questions go to SU (or U&L).
The FAQ's admonition about 'in a professional capacity' means different things to different people and has shifted a bit over time. In recent months, this appears to be a good working definition:
On servers or networking equipment, in the workplace itself, handling or intending to handle production/integration tasks, managed by administrators specifically authorized to do this kind of work.
Which doesn't cover the storage questions we get, but it's good enough for this task.
This depends upon the context of the question. Our FAQ clearly states "Server Fault is for system administrators and desktop support professionals, people who manage or maintain computers in a professional capacity.".
If the question meets those criteria then it has a home on SF.
Having had a look at questions tagged rsync on SO please remember the mantra 'Don't migrate crap'.
I use rsync both at home and at work. If I had a question in relation to the former it would belong on SU, whereas for the latter it's proper SF material. Pretty simple really. Why would you image it belongs on only one or the other?