Which would be best for backing up a mac with time machine function?

This question cannot be answered with a single simple solution. First, all hard drives deteriorate over time, even SSDs. In selecting a backup drive start with the size of the drive in your Mac. I like to double the backup drive size, so if you have 2GB drive then at least 4GB backup drive. Secondly, it is important to know the expected life of the backup drive and build it into your computing solution to be replaced before that happens. So if the expected life say of an HD is 3-5yrs, plan to replace it in that time. Yes it could last longer, but how valuable is your data? These days, cloud backup services are inexpensive and reliable, and provide an excellent retrieval system should your computer fail. I have purchased a massive 18TB drive, but it is for video archival and it does not run 24/7 as a backup so I expect it to last a very long time. Hope this helps.

How many Thunderbolt cables does it come with? Does it come with other cables?

I was pleasantly surprised it came with a thunderbolt 3 to 3 AND a thunderbolt 3 to USB! Excellent product. I own 3.

Does it have a power..? Fan?

This is A 6 gig G-Drive Pro. There is no mention of a fan in the tech specs, but it does have an external 117 VAC power adapter/transformer. This unit is used under a heavy load all the time. It gets warm but not hot

Why does my search for G-Drive suddenly come up with "Sandisk" - and is there anything different with these drives from the version from 2020?

Gtech was rebranded as Sandisk professional earlier this year The actual drive and housing is the same The part number and packaging has changed Gtech and Sandisk are both part of WD

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🚀 Elevate your workflow with pro-grade speed and storage — don’t get left behind!

PLUG PLAY MAC READY - Out-of-the-box HFS+ compatibility with Mac, plus easy Windows reformatting for cross-platform flexibility.
MASSIVE 4 TB STORAGE CAPACITY - Store your entire creative library with enterprise-grade reliability and speed.
7200 RPM ULTRASTAR DRIVE POWER - Enterprise-class rotational speed ensures consistent 200MB/s read/write performance.
EXPAND YOUR SETUP EFFORTLESSLY - Daisy chain up to 5 additional devices for a clutter-free, high-performance workspace.
BLAZING FAST THUNDERBOLT 3 CONNECTIVITY - Experience ultra-low latency and 20Gbps transfer speeds for seamless multimedia workflows.

The SanDisk Professional 4TB G-DRIVE PRO combines dual Thunderbolt 3 ports and a USB-C interface with an enterprise-class 7200RPM Ultrastar drive, delivering up to 200MB/s read/write speeds. Designed for business and multimedia professionals, it supports daisy chaining up to 5 devices and offers seamless Mac compatibility with a 5-year warranty for reliable, high-performance desktop storage.

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Brand	サンディスクプロフェッショナル(SanDisk Professional)
Manufacturer	Western Digital Technologies, Inc.
Series	G-DRIVE Pro
Product Dimensions	21.01 x 13 x 4.6 cm; 1.23 kg
Item model number	SDPH51J-004T-NBAAD
Color	Space Gray
Item dimensions W x H	21 x 13 x 4.6 cm
Hard Drive Size	4 TB
Hard Disk Description	Desktop
Hard Drive Interface	USB-C
Hard Disk Rotational Speed	7200 RPM
Hardware Platform	Mac, PC
Operating System	Windows
Are Batteries Included	No
Item Weight	1.23 Kilograms

SanDisk Professional 4TB G-DRIVE PRO - Thunderbolt 3 USB-C 7200RPM Ultrastar Drive Inside - SDPH51J-004T-NBAAD Enterprise Class Desktop Hard Drive

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