It's not modern technology that's erasing our pasts, but cloud-based services owned by someone else. So I'v always keen on local software - for instance, I'm currently upgrading my was staled desktop mindmap software (http://innovationgear.com/mind-mapping-software/) ;)
It works well when a drive is past the point where its internal error correction code no longer works, but you just want to beat the right answer out of it with a baseball bat.
These days professional disk recovery by a lab is sub-$1000 and they recommend not using brute force tools like Spinrite because it can also exacerbate the problem before they get hands on it.
(side note: the title of this post is a little sensational imo. the past has always "disappeared". Don't forget that you will die some day and eventually there will be no trace of your existence)
Now that I'm looking for it, I don't see Calendar listed as one of the products controlled here, but it might be grouped under GMail or something.
I lost a bunch of emails from my now passed mother which I went to go look for, and found out that Gmail chopped history.
[0] https://support.google.com/calendar/thread/818677/how-far-ba...
While it's always interesting/practical ("just because") to have a full takeout sitting around locally, that would probably create a multiple GB tome (all of Gmail, Drive, ...) that would a day or two to generate and then potentially a while more to download, so for this experiment hitting "Deselect all" and then checking "Calendar" should be good enough.
The process of generating the takeout archive and downloading it are distinctly separate steps with some indeterminate amount of time in between, so you could very likely initiate the takeout from your phone, then follow up on the download link(s) it emails you when you get to a computer (IIRC the archive(s) hang around for a couple of days).
If you do indeed find deleted entries (nooo), I found that (a) Google Calendar itself has no auto-delete functionality (https://support.google.com/calendar/thread/3530801/how-do-i-...), but that if you have your calendar set up to sync with other software, that software might be issuing "deletion" requests (possibly under the guise of auto-cleanup...?) that is then getting synced back to Google Calendar (https://support.google.com/calendar/thread/8849196/my-calend..., https://www.makeuseof.com/events-deleted-automatically-googl...).
Out of curiosity, what people are you referring to?
Logged in to my yahoo account that I haven't used in more than 10 years to look at some convos I've had with a good friend. There was nothing there. Yahoo forums are full of people that want to recover messages from their deceased loved ones, and won't be able to.
I find it fascinating that the only traces remaining of our lives will probably be archived on some NSA server somewhere... Flashbacks of that X-Files episode with the underground bunkers full of DNA.
I've got conversations from 15+ years ago with girls I liked, friends I loved and everything in between. It's hard to watch, but if I ever feel nostalgic I can bring them up in a flick.
I'm not even 30 yet.
edit: Make that 2011
So modern technology is literally erasing our pasts. Not just calendar entries, but messaging systems (people used to keep handwritten letters for decades), and possibly even photos (if we're not careful about preserving them).
Edit: See my clarification of the 2 years in comment https://news.ycombinator.com/item?id=30084620 below. I still think the point remains - we do not own or value our digital data in the same way as physical objects, and there is a much heightened risk of that data disappearing as a result, either by the owners of the platforms the data is stored on archiving the data or by us not valuing it enough to preserve exports and backups through long periods of time.