Unfortunately, as an open source & volunteer project it is very difficult to estimate how much time people will be able to donate to working on Duplicati. As a result of that absolute dates for release are pretty much impossible - though we do get hints from time to time when kenkendk posts comments saying a new experimental is coming “soon” or “this month”.
The different channels are described more fully in the link below, but the short answer is:
-
stable: no known major (and few if any minor) issues -
beta: tested and on the way to stable, while likely to have some errors nothing major has been found -
experimental: cutting edge introduction of features, likely NOT fully tested so might have some serious errors -
canary: testing of new features & bug fixes, a way for developers to get updated code out to end users with specific issues or needs
Note that technically Duplicati 2 has yet to reach the stable channel, but the beta channel has been found stable-enough by many users / business for every day use. (That’s a testament to the effort the developers put into their code, not a recommendation for people to consider beta production ready.)