Q: Does installation delete all data from storage?
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Mar 12, 2016 11:36 AMby Nubz N.,Hello PhilippKa-Li,
It sounds like you are wondering if installing Windows with Boot Camp will delete the existing data on your Mac?
No it does not but it's always recommended to have current backups at all times, and expecially before a major change.
OS X El Capitan: Alternatives for backing up your Mac
See
Install Windows on your Mac - Boot Camp Help
Prepare your Mac for Windows
Boot Camp Assistant helps prepare your Mac for Windows by creating a new partition for Windows, then starting the Windows installer.
It creates the added partition in place, leaving your existing files on the Mac partition.
Please read through those Help files for all the details.
Best regards.
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Mar 12, 2016 11:43 AMby Loner T,Unless you choose to, BCA will not delete your OS X files.
Please start at How to install Windows using Boot Camp - Apple Support .
Nubz N. already posted the BC Assistant Help link.
It is highly recommended that you back up OS X before you start using Bootcamp.
