Hello,
I have two Fairphones (3+ and 5). Before using Iodé, I automatically backed up my phones to my Nextcloud instance (locally on an Ubuntu server) with SeedVault.
With IodéOS, it’s not possible to back up to Nextcloud.
The only possible backup is to the phone or SD card.
Is there a reason for this? Or am I missing something?
I have a fairphone 3+ and a nextcloud in selfhosting. In the beginning I had the same problem, but I resolved and the seedvault backup works fine.
In tha DAVx app i clicked on the sandwichmenue and the in webdav-installations. Clicking on the + a new windows opens and you can insert your webdav directory and the credentials and it should create a webdav access .
Now you go to seedvault and choose the webdav as your backup point.
Hope that it works for you like it does for me.
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Thanks a lot jhansen, I didn’t think of that ! 
Hi. Weird, I do have the option in System>Backup to save directly to Cloud WebDAV (beta) and then connect to my Nextcloud account.
No need to create WebDAV mount point with DAVx