So I bought this external hard drive case for my old computer, took the hard drive out, and put it in the case. Everything works perfectly fine and it is absolutely amazing.

But last night I forgot to turn it off and it's a little hotter than it normally is, though not too significantly.

This probably isn't a big issue, but I am so paranoid about losing the files on it. Are there any problems with me leaving it on over night accidentally once every week or so? I'm normally really good about remembering to turn it off, but I forgot last night for the first time and I can foresee myself forgetting a few times more before turning it off becomes habitual.

I used to leave my old computer on all the time so that I could listen to music while I slept, but this external case doesn't have a fan.

Is there anything I should worry about after leaving it on all night like that or any issues that can arise from it being left on for long periods of time, up to around 35 hours or so?