Dropbox
 

Yup, Dropbox. I have quite a complex trip coming up involving multiple airlines, traveling to more than a handful of countries and stays at more than a few properties. I've put all the info on my Dropbox along with my visas and passports. My thought is to be able to access the info no matter if I lose my hard copies, laptop, or phone (as well as my wife having access). Any downside to this?

Not worried. I just asked if there was a downside. Couldn't see one myself but I'm not the techiest chap in the land. Seems an simple solution should something go terribly wrong.

As a non techy, I love Dropbox. It just works unlike so many of the other similar types of things which are too complicated. The one downside of which I am aware is that if you (or someone who has stolen your laptop) alter or delete a file, then it remains altered or deleted - you don't get the opportunity to get it back.

I would use Google Drive instead, particularly because you can keep current and previous versions of files, plus it has two-factor authentication option (I don't know if Dropbox does). But YMMV: I personally find Dropbox confusing to use especially when people want to "share" folders with me.

I've been doing this for about 10 years. To date I've never had to use it in anger, but I've yet to find a downside.
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Nope. 30 day history for all files (more with the paid versions), plus they now have the ability to "Rewind" back to a date to bulk-revert files in the case of something like you described.

It does. If you were just using it for an emergency repository then it would be an interesting decision as to whether to use 2FA (and thus make it harder to access in an emergency, when you might have also lost your phone/2FA backup codes/etc), or not to use 2FA (making it less secure).

Dropbox has version history for 30 days by default (I think it's more on the business tier). 2FA has been around for a few years.

I actually tried to move from Dropbox to Google Drive last year to save a bit of money. However, Google Drive was just too flaky, and I found it didn't actually synchronise properly a lot of the time (I was using the Mac version). Dropbox has been rock-solid for me,

If you have your own email details that you could log into from any device then you could also just save all the details as an email in "draft". Then you could log in and access it. Can be done with hotmail/gmail etc and others.

Dropbox also has offline access for files.

Do you have any references to back up that statement?

Completely agree with you.