Resolve "Create a collection"

Closes #38 (closed) and #25 (closed) #27 (closed) #37 (closed)

roles/ynh_backup/defaults/main.yml

+---
+#-----------------------------------------------------------------------------#
+# ansible-yunohost allows to deploy Yunohost using Ansible                    #
+# Copyright 2021-present Lydra https://www.lydra.fr/                          #
+#                                                                             #
+# this program is free software: you can redistribute it and/or modify        #
+# it under the terms of the GNU General Public License as published by        #
+# the Free Software Foundation, either version 3 of the License, or           #
+# (at your option) any later version.                                         #
+#                                                                             #
+# this program is distributed in the hope that it will be useful,             #
+# but WITHOUT ANY WARRANTY; without even the implied warranty of              #
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the                #
+# GNU General Public License for more details.                                #
+#                                                                             #
+# You should have received a copy of the GNU General Public License           #
+# along with this program. If not, see <http://www.gnu.org/licenses/>.        #
+#                                                                             #
+#-----------------------------------------------------------------------------#
+
+# Variables for backup
+ynh_backup:
+  scheduled: False
+  # directory: "/data/backup"
+  # scheduled_hour: 3
+  # scheduled_minute: "0"
+  # scheduled_weekday: "*"
+  # scheduled_month: "*"
+  # system: True
+  # apps: True