Dropbox backup stopped working, what should I do?
If the automatic backup for the Dropbox backup integration doesn't work anymore, you should be able to fix it by reconnecting the integration.
1) Click Disconnect here: https://feedly.com/i/account/integrations
2) Go to Dropbox and click Disconnect under Feedly Vault here: https://www.dropbox.com/account/connected_apps
3) Once you're all disconnected, connect again from Feedly: https://feedly.com/i/account/integrations