Two weeks notice before a service that was meant to help "privately remember your memorable days" deleted all of those memories? Time to find out who runs this and never trust them with anything again. Two weeks is laughably short and disrespectful to your users. If at least they were open about the issue that forces them to shutdown, maybe users would be able to help out by donating to keep it online for longer? Shi…
What would you say is an appropriate amount of time?
It could take more than a couple of weeks for many users to realize the service is shutting down (skip past the email in their inbox, etc.)
Even if a user receives notification with the full two weeks notice, they could be on vacation and unable to download the files.
They could figure "Oh, I'll make a note to download my stuff when I get home from work" then forget all about it.