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macOS 10.13.x High Sierra notes.
IMPORTANT - PLEASE READ THIS IF YOU PLAN ON UPGRADING TO HIGH SIERRA 10.13
Rates from 1st October 2017:
Hourly charge (flat): £49 per hour
Local call out: Free
London call out: £54
The latest version of macOS uses a completely new filing system known as APFS. Beta notes from Apple were not very detailed and consequently current OS service tools are not compatible with the new OS and cannot be used to repair errant software.
I advise waiting until around early 2018 before updating your Mac to High Sierra, this will allow time for Apple to debug the OS and for developers to complete coding and testing on repair tools.
If you do feel the need to upgrade to High Sierra immediately, take a full Time Machine backup on a separate external hard drive whilst still on your current OS, and then leave it disconnected from your Mac. Should you then need to roll back to a previous OS, this will make it possible.
Due to demand outstripping availability, Mac Doctor Norwich is currently serving existing customers and client referrals only.