Hi Everyone, Bought my first Mac (finally!) 2015 MBP 2.2Ghz / 16GB RAM / 256 GB SSD Want to know - any tips for things I might not know about? Not sure if this machine has the older OS installed. Since it's a 2015 model, but bought in 2018. If it does have an earlier OS, can I set it up in a way that it does NOT download and install the latest OS? (Would want to keep and evaluate the older OS vs new OS before switching, if possible). Also, how do I set up a back up system - so that I can manually back up the entire Hard Drive to an external hard drive, but in a way where any files I delete or rename on the laptop are also deleted or renamed on the backup? Does TimeMachine do that? Any other/better options? Also, what about backing up my new freshly installed system? Before I put a single file or program on it? Is that a good idea, so I can go back to square one without reinstalling, if needed? And how to do so? Any other insider tips? For a squeaky clean new Mac? Thanks in advance. Excited to be on the Mac side now --- Post Merged, Mar 6, 2018 --- PS: I'm coming from Windows 7, and will transfer my files manually. Also, I may be installing Windows on this MBP at some point. Either by BootCamp or a virtual machine like Parallels or similar. (I don't really know what I'm talking about here, just read a few things so far... --- Post Merged, Mar 6, 2018 --- PPS: should I set up an anti-virus before jumping online with it? I have a license for ESET Smart Security I can install.