I also have an eBay account that I still use from 1999.
The other one that people seem to be impressed with is my Netflix account is from 2003. I was ordering DVDs in college and it blew people's minds that I was renting DVDs through the mail at that time. I tried to buy their stock back when they tried splitting the company into two entities. I think the stock was like $5 at the time. Unfortunately it was a lot harder to buy stock back then.
I suggested local storage only for the case where a new user (not logged in) has added some tasks and then decides to sign up. The tasks in local storage would then be added to the user once it is created. The local storage acts as a temporary storage location while the user is created. Having this work across platforms is not necessary.
The other one that people seem to be impressed with is my Netflix account is from 2003. I was ordering DVDs in college and it blew people's minds that I was renting DVDs through the mail at that time. I tried to buy their stock back when they tried splitting the company into two entities. I think the stock was like $5 at the time. Unfortunately it was a lot harder to buy stock back then.