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Yeah. I've always inherited my dad's old machines with everything on, this is the first time I'm starting fresh. I'm going from 500GB to 125 and i realised i couldn't take all the data, and since the apps don't transfer cleanly there seemed to be no reason not to start clean.
All my old stuff's backed up onto external drives and new stuff's on dropbox. I've been working in a kind of peripatetic way (different machines and locations) for a couple of years so this new lightweight mode of macbooking should suit, even though it feels weird not to have loads of data right there.
It's been around for a while so you should be OK - they announced 'High Sierra' not so long ago -not sure when it's due.
I'm always one for starting from fresh installs rather than backups. Helps refine what I actually need. All my project files and documents are in Google Drive anyway so it's just some apps and I prefer to install them as I need them where possible as I'm forever trialling new bits of software that I quickly forget about (Sketch comes to mind) and never uninstall. If I were to backup it'd take forever and mostly be a waste of time.