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It's fine. As long as you are not overclocking.

I usually use Macrium Reflect's free version. Has worked for me so far.

Wile that older i7 of yours is bottlenecking your GPU a bit, your framerate is much more dependent on GPU than CPU. The 3900x will be within 1 or 2 frames of the 9900k with a 2070. The new 10900k launching at the end of May supposedly clocks up to 5.3ghz, so that may be slightly faster. Just getting a 2080 Super with a 3600 or 3700x will be more of an upgrade as far as framerates are concerned. But if you are currently getting 180fps, the difference between that and 240fps will likely not be noticeable at all during gaming. I'm assuming you are asking because you have a 240Hz monitor?

CPU: AMD Ryzen 7 3700X 3.6 GHz 8-Core Processor (£269.00 @ Amazon UK) CPU Cooler: NZXT Kraken X63 98.17 CFM Liquid CPU Cooler (£119.99 @ Box Limited) Motherboard: Asus ROG Strix X570-F Gaming ATX AM4 Motherboard (£234.99 @ AWD-IT) Memory: Crucial Ballistix RGB 16 GB (2 x 8 GB) DDR4-3600 Memory (£89.99 @ Amazon UK) Storage: Crucial P1 1 TB M.2-2280 NVME Solid State Drive (£101.18 @ Amazon UK) Storage: Toshiba X300 4 TB 3.5" 7200RPM Internal Hard Drive (£92.98 @ Laptops Direct) Case: Lian Li PC-O11 Dynamic ATX Full Tower Case (£114.95 @ Box Limited) Power Supply: SeaSonic FOCUS 650 W 80+ Gold Certified Fully Modular ATX Power Supply (£95.47 @ Scan.co.uk) Total: £1118.55

For this kind of system maybe consider a Gen4 nvme ssd? Possibly something like a Corsair mp600 or even a Sabrent Rocket? Obsidian 1000 is massive overkill for an air-cooled system. That case is meant for dual loop custom watercooling with giant radiators. The 1600w PSU is also slightly ott. Your system should pull around 900 to to 950w under full load, so unless you are overclocking heavily, a 1200w psu should be plenty. Of course there's nothing wrong with having the extra headroom a 1600w would provide.

The cooler it comes with is completely fine unless you are overclocking or running sustained heavy compute loads (like heavy video encoding for hours at a time)

I'd go with the crucial P1 (or similar) nvme if I was you, along with the faster memory.

Or you can save the $2000 so you can upgrade to a 3080 Ti when that launches in 3 months, and the 10900k Intel cpu when that launches in a couple of weeks.

Well, you can always change out the GPU for a Titan RTX, custom loop watercool the whole thing, and maybe go AMD 3950x so you can can use a PCIE Gen4 nvme ssd.

Only a $15CAD difference in price between the 3600mhz and 3200mhz Ripjaws? Personally I'd spend the money, but YMMV.

I'd get a 3700x instead. You can overclocked a 3700x to run the same speed as the 3800x. The difference between the two is negligible in everything but price. The 3800x is just a binned 3700x. 2 things I would consider as well: What is the price difference to upgrade to a DDR4 3600mhz cl16 kit? How much more is a m.2 nvme drive instead of the 2.5" sata? Maybe something like a WD Blue s550, a crucial P1, or whatever is available ?

I think your build is fine. I may have chosen a slightly different mobo, but there's nothing wrong with the one you picked. Really, everything looks good.

Guideline, YMMV: Depending on where you are, different fans, watercooling kit, etc, may be appropriate.

For a Ryzen 3600 its worth saving up for faster RAM. Preferably 3600mhz cl16.

The longest standard thunderbolt 3 cables are currently 6.6ft (2m). A long length optical version has been "in the works" by Corning for over 2 years now, and is ”coming soon" Areca has 10m, 20m and 30m optical TB3 cables, you can find them at B&H at suitably ridiculous prices.