An option to synchronise _all_ tabs from CopyQ would be brilliant

**Is your feature request related to a problem? Please describe.**
I have been using CopyQ on my primary machine, a Ubuntu machine, and in Windows (10) in a VirtualBox VM in that machine and on a standalone. CopyQ has saved me hours and hours: brilliant. The Ubuntu machine crashed on upgrading from 18.04 to 20.04 and though most things were nicely backed up, my VM drive didn't (I don't know why and that took out the CopyQ store there). I have rebuilt a new VM with new installation of CopyQ in both Ubuntu 20.04 and the Windows VM and both work and the VirtualBox bidirectional synch of the clipboard works and I found I had a fairly recent export backup of the CopyQ data (the simple restored data didn't work: no idea why not). I restored that and exported again (not sure why!) and imported in the VM: all super. But I would love to set up continuing automatic synching of the tabs and storage in them. The Ubuntu machine is so much my main machine that I only really need to synch from that to the Windows VM (via folders in my home folder that is shared into the VM). I guess I could also share it to dropbox to get sharing between that machine and the standalone Windows machine but I use that so little I think I can do without the DropBox need. So now to the wish ...

**Describe the solution you'd like**
I started setting up the directories to synch (that no longer seems to need an extension in Windows so I think the documentation is out of data). However, I have discovered that there seems to be a fixed limit on the number of tabs that can be synched and I have quite a few (and some nested ones). I also found that the files only seem to be spring up in the directories I create if I change what's in the tab.

I would love a solution that simply allowed to designate all tabs to be synched and for that to create a folder structure following the names of the tabs. (A bit like the option in export ... which is great!) I would also love it to synch all existing content as fast as it can not to wait for changes. I guess finally (I'm demanding aren't I?!) it would be lovely to be able to designate multiple synch copies as that would make synching to multiple other machines easier (and perhaps make it easier to do that without having to use DropBox).

**Describe alternatives you've considered**
The only alternative I've thought about at the moment is to see if it could use exporttab FILE within a cron job and remind myself how to set up a timed command in Windows (I seem to remember it's possible by defining it as a service but it's years and many versions of Windows since I last did that).

**Additional context**
I don't think there's any useful context I can see at the moment. Very happy to supply more information if that helps.