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Some arguments in borgmatic cli don't work anymore. They have been replaced in the latest commits of the Ansible role yet no new release have been published yet. Therefore, we are going to fix the borgmatic version to an older which works with Ansible role 0.9.3. https://github.com/borgbase/ansible-role-borgbackup

refactor(ynh_backup): refactor YunoHost backup tasks and readme to be more explicit w/ what we expect from user

docs: advise to use Ansible Vault
fix: use gather_facts module in order to get facts for borg role