This is what I have actually done so far:
- Backed-up via Time Machine to a low-cost (£60) USB-powered 0.5TB hard drive that will be carried around with the laptop (can that drive be backed-up itself?)
- Turned off Time Machine (auto-backups) afterwards.
- Updated everything
- Several system restarts required, and re-ran the Update function until no more updates available.
- Backed-up again viaTime Machine.
Next I intend to set it up for BootCamp-Windows7, because I guess this is best done while my Mac OS system footprint is still small (so it won’t spend ages repositioning blocks of my (to-be) installed Mac apps when the disk gets repartitioned for BootCamp).