Restore a CardDAV address book that has been heavily used offline?
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After backing up all my apps and their data, i updated my Lineage OS.
When i restored my Apps, it turned out that i had an CardDAV address book in use that was offline for a long time. Many contacts have been updated in the phone but never been synced. The problem is that i can't re-establish the account within the new instance of Lineage, because the URL (and it's server) is dead.I had no success restoring Contacts, Contact Storage Provider (What does that by the way?), DAVdroid or Accounts.
[Q] How can i restore the contact data of the above mentioned CardDAV address book?Updating a Samsung Galaxy S5 from Cyanogenmod 12 to Lineage 14.1 - using oandbackup and DAVdroid 1.9-ose
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All contacts are stored in Androids contacts storage provider. If the sync did not run properly and your contacts storage is corrupt you can't get your contacts back. I suggest to maybe look in the SQlite database directly. If you've a rooted phone as it seems you can access it also via adb. Look at our FAQ at point 3 and 4:
https://www.davdroid.com/faq/how-to-debug/#c77
Maybe you can copy them from there or at least save it.
Also have a look here for a better understanding of the components involved with DAVdroid:
https://www.davdroid.com/faq/system-integration/ It always helps
