I have two Mac Mini's with USB 3.0 RAID 10 storage. I work with files from one Mac Mini through my MacBook Air. After I save what I'm working on, I remote in, and run the rsync script that copies from server 1 to server 2. This is tedious and time consuming. I'm considering making rsync run every 15 minutes. My concern is, if rsync needs more time to copy before the next 15 min, will another rsync session start? And if it does start, will it try and copy the same file twice because rsync does not yet see the large file copied over completely yet? Also, I notice that even if I don't update some files, rsync will still copy them because their modified date changes or something. Just trying to figure out a way to keep the two servers in sync. Most of it is a one way sync (Server 1 -> Server 2). Server 3 backups Server 2. Otherwise, I might just run two copies of Windows Server 2012 and use DFS/Replication but I'm concerned about Mac files being on a windows share as I heard issues with file forks, meta data, etc.