Hello, live data are persistent until you delete them, so backup is not a real necessity. AppEngine has replicated servers to handle failures, and they have proved to work very well (search the groups for "post mortem" to see how outages were handled).
The bulk loader can be used to import, export and transform data between apps, and to localhost. If you experience live data loss (i.e. you cannot read data from your previously deployed version) this is probably an app design issue. I suggest you keep a separate app to test data model changes against real data between deploying to your business app. Maybe other users can suggest more tools to handle data transformation. regards Lorenzo On Oct 29, 1:44 am, qiwawa <deng...@gmail.com> wrote: > Thanks Lorenzo. I'd prefer if Google AE can provide a way for us to > back up the data and restore it back. > > An export/import tool will be the most useful and make me feel better > that my data is safe. > > Is there a way to back it up? > > Thanks again. > > Q > > On Oct 28, 3:14 am, "l.denardo" <lorenzo.dena...@gmail.com> wrote: > > > Data are persistent across deploys. > > You only need to keep the same name for the entities and have > > compatible models. > > If you cannot see old data, probably you have done changes to your > > data model. Anyway, you should be able to see your application data > > from the admin console (datastore viewer). This can help you determine > > whether you are having trouble with data persistence or with changes > > in your data model. You should see all your previously existing > > entities. > > > If you mean "update local data to live servers", so you can use data > > you produced on your local machine to initialize your app, there's a > > tool called bulk loader. I never used it but there's an interesting > > post on Ikai Lan's > > bloghttp://ikaisays.com/2010/06/10/using-the-bulkloader-with-java-app-eng... > > > Regards > > Lorenzo > > > On Oct 28, 2:23 am, qiwawa <deng...@gmail.com> wrote: > > > > Is this a non-issue at all? Anyone? > > > Thank you. > > > > On Oct 26, 7:37 pm, qiwawa <deng...@gmail.com> wrote: > > > > > I wanted to keep the data when upgrading my app to a new version. How > > > > can I do this? > > > > > Each time I upgrade it it looks like my data was lost. There is no way > > > > in admin area that i can back up my data before upgrade. > > > > > Thanks. > > > > > Q -- You received this message because you are subscribed to the Google Groups "Google App Engine for Java" group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
