Logging or viewing serial data

Hello
I've been using the Arduino serial monitor for years, but the PC is struggling to keep going for more than a few days.
I've tried Coolterm as well, but that doesn't seem to be much better, even when the buffer is increased.
They both stop working.
I usually copy the data into Excel for analysis.
I wondered if anyone had any ideas how I might branch the data off to something more reliable, software or hardware.
I don't have the time to set up an SD card or anything else, so something commercial would be acceptable.
Even a cheap PC dedicated to reliable data gathering would be OK as well

have you tried setting coolTerm to send the data to a file ?

Thanks
No.
What happens though when Coolterm stops?
Quite often it's OK if I don't look at it too often, but it can stop within minutes of looking at it with all the attendant resets of the Mega I'm using.
I'll certainly try it.
When I said branching, I literally meant something like a hardware sniffer that sits in the USB cable.
Another approach might be to use the spare serial ports on the Mega.
The problem I'm having isn't with the Mega that has been churning out data for years, it's the with the PC or serial terminals running out of steam.
The telly does the same - leave it on standby for long enough and it gets slower and slow to respond - pull the plug out and it behaves again.

I'm on a Mac, can't tell how robust this is on windows... On Unix you would run a command line to get the stream to a file ( the screen or cu commands)

just quickly tried it - looks good.
It will be interesting to see if it keeps going.

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