Backup of (standalone) task lists

[gryban1]

Is your feature request related to a problem? Please describe.

After introducing the calendar backup option I hoped that task lists would also be backed up, because some time ago tasks were only able inside of calendars. So I thought today where you can create calendars without tasks and standalone task lists this would be included, but my tasks are not backed up. (Not implemented or bug?)

Describe the solution you'd like

Please implement an option to backup task lists as well as calendars.

Describe alternatives you've considered

--

Additional context

--

[vince-from-nice]

Same issue here : the backup feature seems to work only with contacts and regular calendars (ie. ics files with calendar events). But there is no backup for my todo lists used by the tasks app though they are also ics files (but only with todo events, no calendar events).