Seriously, don’t upgrade without a backup of your important data. Make sure you have a current Time Machine backup or make sure that you have another backup method in place.Įven if you only make sure your Photos are in iCloud and your important documents are in a could service you will be prepared.
The chance that you will lose any of your data is slim, but it can happen. There will be at least 20 minutes of downtime during the installation, but it could be as much as 30 minutes.
FI you are installing macOS Sierra 10.12.4 from a more recent version of macOS Sierra, you can expect the update to take about an hour including the download process.
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