backup nextcloud data folder owned by www-data

[zkzkzk2015]

BorgWarehouse version :
3.1.1
Installation type :

• Docker
• Baremetal (Debian/Ubuntu)
• Other environment :
  truenas scale 25.04.2 custom app

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Describe your problem here.

Nextcloud is running on a digital ocean droplet. I want to back up my data folder owned by www-data to a remote local truenas/borgwarehouse instance with following working command: borg create ssh://borgwarehouse@my local truenas instance/home/borgwarehouse/repos/16xxxx::nextcloud-$(....) /nextcloud/data --compression lz4

above command throws a permission denied error, as expected. because "normal" user can of course not access www-data directory.
How can I solve this problem, because i can not use sudo?