After about a day of work, the download speed from the Internet to wired and wireless networks dropped from 65 Mbps to less than 1 Mbps. I installed a different brand of router and the problem went away. My wild guess is that the heat from the router's CPU combined with the heat from the 3TB hard drive was more than the fan (which draws air in and expels it through the same hole in the base) could compensate. I returned the device and bought an Apple AirPort Extreme Base Station (ME918LL/A) instead, which I will use as a faster (ie faster than my existing wireless router) and centrally located wireless access point. The existing router in our boiler room seems to work adequately as a router. I can create the equivalent of a Time Capsule by adding an external hard drive to AirPort. Both configurations support writing Apple Time Machine backups. Another wild guess: when this device was repaired, it could have been tested for less than an hour, which isn't enough time for a performance issue to arise. I shouldn't have assumed that "recovery" meant the device was adequately tested. If you try this device, I hope you have better luck than me! Another observation. The return process was almost effortless.
2 TB External HDD Western Digital WD Elements Portable (WDBU), USB 3.0, black
84 Review
π Seagate Backup Plus Slim STHN2000400 2TB Portable Hard Drive - Black: Your Reliable External Storage Solution
93 Review
Shock-Resistant Transcend StoreJet 25M3 USB 3.1 Slim Portable Hard Drive with 500GB Capacity
99 Review
2 TB External HDD ADATA DashDrive Durable HD650, USB 3.2 Gen 1, Blue
55 Review
πΎ SanDisk 2TB Extreme PRO Portable SSD - Ultra-Fast Speeds up to 2000MB/s - USB-C, USB 3.2 Gen 2x2 - High-Performance External Solid State Drive - SDSSDE81-2T00-G25
10 Review
π StarTech.com 3.5in Silver Aluminum USB 3.0 External SATA III SSD / HDD Enclosure with UASP - Portable USB 3 3.5" SATA Hard Drive Housing (S3510SMU33)
10 Review
SAMSUNG T7 Touch Portable SSD π½ 2TB: High-speed, Secure & Compact Solid State Drive!
17 Review
Seagate BarraCuda 500GB Internal Hard Drive HDD - Reliable, High-Speed Storage Solution for Desktop PC - SATA 6 Gb/s, 7200 RPM, 32MB Cache (ST500DM009)
11 Review