We want to upgrade Nextcloud 10 to 14

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Nextcloud version (eg, 12.0.2):
Operating system and version (eg, Ubuntu 17.04):
Apache or nginx version (eg, Apache 2.4.25):
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The issue you are facing:

Is this the first time you’ve seen this error? (Y/N):

Steps to replicate it:

The output of your Nextcloud log in Admin > Logging:


The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):


The output of your Apache/nginx/system log in /var/log/____:


We have launched new instance and installed latest version of Nextcloud, no we are trying to restore the backup from nextcloud 10 to the new one and we are getting errors.
Exception: Creation of bucket failed. Error executing “CreateBucket” on AWS HTTP error: Client error: PUT resulted in a 403 Forbidden` response: <?xml version="1.0" encoding="UTF-8"?> AccessDeniedAccess Denied4DD137 (truncated…) AccessDenied (client): Access Denied - <?xml version="1.0" encoding="UTF-8"?> AccessDeniedAccess Denied.
Buckets are already present in S3 , we need to re-use the same from new instance.

In general skipping major versions is not supported by Nextcloud as described here.