You can easily toggle hidden files by hitting Command+Shift+Period in any dialog window.

"Save As..." used to be a default option in the File menu but now it's hidden by default. Not to worry, with a simple keyboard app shortcut you can regain the uber convenient "Save As..." option in the File menu.

• Open the  Apple menu and choose "System Preferences"
• Select "Keyboard" and then choose the "Shortcuts" tab
• Select "App Shortcuts" then press the + plus button to create a new shortcut for All Applications
• Set the following for the keyboard shortcut:
Application: All Applications
Menu Title: "Save As…"
Keyboard Shortcut: click into the field, then press Command + Shift + S
• Click "Add" to finish adding the "Save As..." keyboard shortcut and close out of System Preferences

The "Save As..." will now appear by default in the File menu of apps, and be available instantly as the Command + Shift + S keyboard shortcut. You can test this out yourself by going to any app that supports file saving and you'll find the File menu now includes the "Save As..." option by default, along with the keyboard shortcut.

The modern macOS default keyboard shortcut for "Save As..." is the finger twisting combo of Command + Option + Shift + S. All we're doing in this particular App Shortcut is to remap that complex keystroke into the familiar and easier to manage Command + Shift + S keystroke, which was the default in Mac OS for much of Mac history. This change may not be for everyone, but if you're a fan of using "Save As...", you'll undoubtedly appreciate knowing that you can get this great file saving feature back with a simple effort.

To start up your computer in AHT:

• Shut down your computer
• Press and hold the D key
• Press the power button to turn on your computer

Computers that shipped with OS X Mountain Lion (or later versions of OS X/macOS) support the use of AHT over the Internet. These computers will start up to an Internet-based version of AHT if the hard drive does not contain AHT. An Internet-enabled connection via Ethernet or Wi-Fi is required to use this feature. To start up to an Internet-based version of AHT:

• Shut down your computer
• Press and hold Option (Alt) and D
• Press the power button to turn on your computer

If the Apple Hardware Test indicates that the RAM memory is faulty you should be able to find instructions on how to replace it in your computer’s manual without voiding the warranty. However, if the problem is related to any other component the only option is usually to hand over the computer to Apple.

HDDs

Unless you’re dealing with secrets that would lead to the overthrow of governments, using Disk Utility’s secure erase feature meets the mark. HDDs can also be physically destroyed with a drill equipped with a bit suitable for puncturing the metal casing. A hammer and chisel could work, too. If you have a dead HDD and if you think anyone with motivation might pay to have the data recovered, physical destruction is the only way to ensure data isn’t readable.

SSDs

Data is written in an unpredictable fashion on SSDs to distribute the wear across all the memory cells in the solid-state device. As a result, a secure erase feature doesn’t work at all, as it may not overwrite all the data. Physical destruction is really the only course of action, which is an unfortunate waste of technology. And if you have a Mac in which the SSD isn’t removable, but part of the computer, that’s even worse.

RAM

Fortunately, the various kinds of RAMs used by generations of Macs are all volatile memory: the contents disappear instantly or shortly after a device is powered down. So far, there’s no way to recover any traces of data from RAM chips.

The new online tools allow customers to get a copy of all data associated with an Apple ID. You can request account details and sign-in records and data such as contacts, calendars, notes, bookmarks, reminders, photos and documents. Apple also stores info like app usage statistics for Apple Music and Game Center, a purchase history of items bought from the App Store and iTunes Store, AppleCare support history and marketing records. 

Only data that is personally identifiable can be found here. This can all be downloaded with a few simple clicks on the privacy portal. To obtain a copy of your data:

1. Log in to privacy.apple.com.
2. Select the "Get started" link under the "Get a copy of your data" heading.
3. Tick the boxes of the categories of data you want to download (iCloud Photos, Mail and Drive are separated into a separate list as this data may be exceptionally large).
4. Press Continue.
5. Select what is your preferred maximum file size (Apple will split up the data into chunks, up to a maximum of 25 GB) and press Continue.

Your data request is now in progress. Data like iCloud Photos will take a long time to generate as there are potentially tens of gigabytes of files. It can take up to a week to prepare the downloads. Apple notifies you when the data is ready to download, and it is automatically deleted after 2 weeks.

Apple says it provides all data in standards-compatible formats. This means it can be used as a way to move all your data to a new cloud service, as well as transparently showing customers what data Apple keeps on you.

Whilst these features will roll out later in the year for other regions, all customers can request data corrections, deactivate or delete their account. You can do this by following the links on the main page.

Deactivation means that Apple will stop processing any data relating to your Apple ID. You will not be able to access any store purchases from iTunes, iBooks or the App Store. You will not be able to access any iCloud data, or use iCloud services like FaceTime or iMessage (see here for more conditions about account deactivation). You are literally cutting yourself off from the Apple connected world. Apple will verify all deactivation requests to prevent abuse. Apple doesn’t delete your info, it just stops anyone - including Apple - from accessing it whilst the account is deactivated. You can re-enable the account by logging back in to the privacy portal and choosing to reactivate it.

Permanent deletion takes this one step further, essentially asking Apple to remove all data they have stored on you - forever. This process is not reversible once initiated.