This feature was lacking in v2, so please consider adding it to v3. My playlists got big and evolved over time as I added and removed what worked and didn't, losing them with no means of external backup was a problem...

Please give this some consideration. I have huge playlists with several hundreds of files. Loosing them is a real concern.

When v3 stable is released, an automated upgrade process should preserve all accounts and playlists.

That doesn't answer my request. I'm asking for a means to import and export a playlist...