leave sentimentality aside and put it all on a computer spreadsheet.
To each his own. Personally, I will never switch to a computer spreadsheet. I'm sure that it is vastly more efficient, but it is too impersonal, and so ephemeral.
I want a book with my contemporaneous printing, with individual flight school stamps confirming my time in various aircraft, etc. Also, whenever I solo an aircraft for the first time, I put an appropriate
rubber stamp image in my book. I guess that you could always cut and paste a digital photo onto your spreadsheet, but somehow it doesn't seem quite the same.