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I already tried to manually copy and the paste the profile folder from one instance to another, but the Lightning extension is not added when doing this and thus my tasks and events can't be synced.

For now I don't need to sync emails, just the calendar events and tasks and also the feed subscriptions.

If possible, I would prefer an offline solution, for example via pendrive instead of a storage service such as Dropbox.

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did you try installing the lightning extension prior to pasting in your backed up folder ? i'do do that first.. then i'd redo all the email profiles (if you have more than one in your backup.. my case..) then close.. and switch with my old profile and/or change the name of the folder randomness with the one specified in the config file .. – marc-andre benoit Oct 19 '12 at 13:35
also.. i wonder.. you use dropbox for backup or for your profile folder's location ? – marc-andre benoit Oct 19 '12 at 13:36

I don't know of any offline solution, but there is an online solution. I'm using Google Calendar and it works really well. Do this to get it up and running:

  1. In the calendar list, right-click and select "New calendar".
  2. Choose "On the Network" and click "Next".
  3. Select "CalDAV".
  4. Enter "" as "Location".
  5. Specify options on the next page.
  6. Use your full e-mail address as username when prompted.

There are some instructions here:

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