If cooling concerns you, there are aluminum external enclosurers available that will dissipate heat better than plastic enclosures. For a little more money, you can also get enclosures that have a built in cooling fan.
I would avoid Seagate internal drives. They've got the highest failure rates of any drive I had.
Anyway to have an internal drive as an external backup, would require you to route a long sata cable and power cable all the way out of the case. So that would be pretty inconvenient.
Heat shouldn't be an issue. They are designed to tolerate the heat inside without any fans blowing them.
I would avoid Seagate internal drives. They've got the highest failure rates of any drive I had.
Anyway to have an internal drive as an external backup, would require you to route a long sata cable and power cable all the way out of the case. So that would be pretty inconvenient.
Heat shouldn't be an issue. They are designed to tolerate the heat inside without any fans blowing them.
I also think that you will be fine with this enclosure. You should worry about cooling it.
Unless you need this drive to be portable, I would say that backing up your data to the drive being connected internally may be more reliable.
If cooling concerns you, there are aluminum external enclosurers available that will dissipate heat better than plastic enclosures. For a little more money, you can also get enclosures that have a built in cooling fan.