Unitek Aluminum USB 3.0 to SATA Dual Bay External Hard Drive Docking Station Expired

This is not a toaster.

I'd be seriously concerned about bad sectors depending upon the cause of those bad sectors. Bad sectors are even present from the factory and naturally occur on an aging drive. The drive will just essentially remember where the bad sectors are and stop attempting to read or write over them after it marks them as bad. The issue comes when the bad sectors are caused by physical damage to the drive from something like a bad head or damage to the platters themselves. At that point, only a data recovery expert with access to both a clean room and specialized equipment (usually a pcie card with sata connectors which is designed for data recovery such as the pc3000.) A good way to know if merely cloning the drive using equipment like this is safe is to listen to listen to the drive as it is spinning for any sort of clicking or grinding noises, and also connect it to your computer first to make sure there are no read instabilities as well. If either of those situations apply to the drive, you will cause damage which will result in further data loss. I would also not recommend using the clone function unless you're absolutely positive the drive is in excellent condition. Even with a healthy drive, I prefer to use the imaging function from good data recovery program, and for free software that does an excellent job, I highly recommend using gddrescue which only runs on linux (you can run linux off a usb flash drive for the cloning process)
The other risk with these types of devices can be overheating. Years ago I did make the mistake of leaving one to clone overnight and wound up burning out the pcb on the drive

Sorry for the extra long reply, but I have done a bit of data recovery professionally and wanted to share the information in the hope it is useful to someone looking at this deal who intends to use it to clone a failing drive. Most professional data recovery is extremely expensive, (aside from one place I know who charges less than a quarter of what they are worth) and I hope my comment helps someone avoid unnecessary cost due to avoidable damage they may cause.