Resolve "refactor: improve backup usage README"

Closes #45 (closed)

roles/ynh_backup/README.md

@@ -36,7 +36,7 @@ ynh_backup:
 
 - `ynh_backup.scheduled`: Enable the YunoHost applications backup feature by setting the value to `True`.
 - `ynh_backup.directory`: the default backup folder is `/home/yunohost.backup/archives`. You can choose to save the backups in another folder with this variable. In this case, in order to be able to restore the backups from the web interface, YunoHost automatically creates a symbolic link from the created archive to its default folder.
-- `ynh_backup.scheduled_[hour|minute|weekday|month]`: modifies the scheduling of the cron task. By default, it will run every day of the year at 1am. For more information about cron time settings, this tool can be useful: <https://crontab.guru/>.
+- `ynh_backup.scheduled_[hour|minute|weekday|month]`: modifies the scheduling of the cron task. By default, it will run every day of the year at 3am. For more information about cron time settings, this tool can be useful: <https://crontab.guru/>.
 - `ynh_backup.system`: Disable YunoHost system backup by setting the value to `False`, the default value is `True`.
 - `ynh_backup.apps`: Disable backup of YunoHost applications by setting the value to `False`, the default is `True`.
 - ⚠️ Beware, once you enable the local backup feature `ynh_backup.scheduled`, you cannot disable system **and** application backups. If you set `ynh_backup.system` **and** `ynh_backup.apps` to `False`, the role will fail.