Choosing a Time Machine Backup Drive

There are several issues to consider in choosing a drive for Time Machine:

• Capacity for current and future needs;
• Performance: a slow drive can interrupt your work or take a very long time to finish. A USB drive is therefore a poor choice;
• Convenience, location, etc: internal or external, at your Mac or in a closet, etc.

These issues are discussed below.

Capacity of the Time Machine backup drive

Time Machine keeps a backup of everything that you don’t explicitly exclude (except for some types of external drives).

In addition, Time Machine keeps versions of files as they change. Lacking enough space, Time Machine will forget about older versions to make space for newer versions, so be sure to provide a large enough backup volume to get maximal benefit of the versioning feature.

For a Time Machine volume, use a drive of at least 50% greater capacity than all your data so that Time Machine can keep its history (so you can “go back in time”).

A figure of 30% should be considered an absolute minimum, double the space of your data is ideal eg a 2TB backup drive for 1TB of data.

Note that this guideline is about how much data you actually have. For example, you might have a 2TB drive with only 200GB of data. You therefore could quite reasonably use a 500GB backup drive for Time Machine, at least until such a time as your data grows much larger.

TIP — If your Time Machine volume cannot hold everything, exclude older items on the backed-up volumes— so much material is static (unchanging) and thus should be backed up to at least two or three external backups. Time Machine is best used for protecting yourself for recent and changing files.

It is best to have formal backups (a minimum of two), and thus Time Machine should be thought of as a short-term protection system. While it can be used for external backups, cloning multiple copies is a far better approach for formal backups in conjunction with Time Machine (which has its own dedicated backup drive which is always attached or internal).

Which hard drive?

A high capacity unit with USB3 is the best option as of 2014. Many users will find 3TB capacity enough, but go with 4TB to extend the years of use without filling up.

Older Macs without USB3 should use eSATA if possible, then Firewire 800 if eSATA is not an option.

Apple’s Time Capsule

Apple’s Time Capsule is an option for some, but its price is relatively high. However, the Time Capsule can also backup another Mac, which brings its relative price down.

Time Capsule has the appeal of being available on a network, so you can locate it away from your Mac. However a wireless network might not deliver acceptable performance (interrupts/degrades use of the computer).

Blazing-fast PCIe storage for Mac Pro Tower

B&H Deal Zone • Deals by Brand/Category/Savings
Deals expire in 12 hours unless noted. Certain deals may last longer.

Sony Mirrorless wish list • Deals on Sony

$899 SAVE $50 = 5.0% Apple 10.5" iPad Pro (512GB, Wi-Fi, Space Gray) in Electronics: iPads and Tablets	$829 SAVE $170 = 17.0% Apple 13.3" MacBook Air Laptop Computer (Early 2015) in Computers: Apple Macs	$1249 SAVE $250 = 16.0% Apple 13.3" MacBook Pro (Silver, Late 2016) in Computers: Apple Macs	$1249 SAVE $250 = 16.0% Apple 13.3" MacBook Pro (Space Gray, Late 2016) in Computers: Apple Macs	$2099 SAVE $700 = 25.0% Apple 15.4" MacBook Pro with Touch Bar (Late 2016, Silver) in Computers: Apple Macs	$1899 SAVE $500 = 20.0% Apple 15.4" MacBook Pro with Touch Bar (Late 2016, Space Gray) in Computers: Apple Macs
$2099 SAVE $700 = 25.0% Apple 15.4" MacBook Pro with Touch Bar (Late 2016, Space Gray) in Computers: Apple Macs	$1149 SAVE $350 = 23.0% Apple 21.5" iMac with Retina 4K Display (Late 2015) in Computers: Apple Macs	$1999 SAVE $1000 = 33.0% Apple Mac Pro Desktop Computer (Quad-Core, Late 2013) in Computers: Apple Macs	$259 SAVE $140 = 35.0% Bolt VB-22 Bare-Bulb Flash in Lighting: Camera Flashes	$1999 SAVE $200 = 9.0% Canon 16-35mm f/2.8 EF L III USM in Lenses: DSLR	$2299 SAVE $500 = 17.0% Canon EOS 5D Mark III DSLR in Cameras: DSLR
$899 SAVE $450 = 33.0% Canon 18-55mm f/3.5-5.6 EOS 70D DSLR with STM in Cameras: DSLR	$1599 SAVE $200 = 11.0% Canon EOS 80D DSLR with 18-135mm in Cameras: DSLR	$179 SAVE $100 = 35.0% Feiyu G5 Handheld Gimbal for GoPro HERO5 / HERO4 in Accessories: Tripods and Support	$800 SAVE $500 = 38.0% Fujifilm X-T1 Mirrorless in Cameras: Mirrorless	$1200 SAVE $500 = 29.0% Fujifilm X-T1 Mirrorless with 18-55mm in Cameras: Mirrorless	$135 SAVE $21 = 13.0% Lexar 128GB 2933x XQD 2.0 Memory Card in Accessories: Memory Cards
$1797 SAVE $200 = 10.0% Nikon D750 DSLR in Cameras: DSLR	$3297 SAVE $800 = 19.0% Nikon D810 DSLR with 24-120mm in Cameras: DSLR	$2698 SAVE $200 = 6.0% Sony a7R II Mirrorless in Cameras: Mirrorless	$2498 SAVE $200 = 7.0% Sony a7S II Mirrorless in Cameras: Mirrorless	$1799 SAVE $1151 = 39.0% Zeiss 15mm f/2.8 Distagon T* ZE in Lenses: DSLR