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Please note that I am tracking the changes in J6 and work on compatibility. 

That said, J6 is still very much in active development with major show stopper changes landing every few days. There is no road map to let us know. There is no documentation for these changes. There is no way to proactively address them. 

The changes in beta 1 are massive b/c breaks. Don't expect any real compatibility before mid September. And even then, the next betas might break something else. Since Joomla provides no clarity to us, I can offer no clarity to you. 

You SHOULD be able to use Akeeba Solo, and I think that backing up as a Joomla site would work too. I have only tested it with the Joomla 6 alpha versions. The beta version only came out 1 1/2 day ago. I did not have the time to do this kind of testing; I am trying to finish up something in ATS before I tackle J6 compatibility.

If backing up as a Joomla site doesn't work, you can definitely use the generic installer for bespoke PHP sites.

I finally got the time to look at the J6 changes.

The application object's input property becoming protected is not that bad, I can replace it with getInput(). Of course, Joomla could've (and should've) simply used a magic __get to automatically address this change without breaking existing software. This feature has been present in PHP for well over 20 years...

The message about Chosen actually comes from core Joomla! code. Instead of removing formbahevior.chosen they kept it, but since the files it relies on are not present it just… breaks the page. Luckily, this has not actually been used since the 3.x versions, so it was as simple as ripping the method call off.

There will be new releases in a couple of weeks. I want to go through all changes they made in beta 1. The change about the application object's input property is not even in the release notes, even though it's a major b/c break. I wonder what else is there that hasn't been mentioned anywhere else but has a big impact.

I have a dev release for you: https://www.akeeba.com/download/akeebabackuppro-dev/10-0-6-dev202508221137-rev82be11b.html Do note that I have only tested this on one development environment.

Please let me know how it works for you.

Awesome! Thank you very much for the testing!

In the meantime I tested this build on 5.3.3 and 6.0.0-beta1 across three different environment and it all seemed to work great using various features, backing up, and restoring.

I will be publishing a new stable version in ~10 days.

So I migrated to 6.0.0 and had an error $input on the plugin "backup before update", after the Joomla update succeeded. I needed to rename the plugin folder name and install the dev version of Akeeba backup.

I believe this has to do with the update not completing.

I have only tested the installation on 6.0.0-beta1 and 5.3.3. I will try to test on 5.4.0 as well.

So, it was just a case of a random failure. It does happen (with any extension), it's just extremely rare. I have had this happen to me a few times. In any case, I will be trying the full upgrade path of 5.3 to 5.4 to 6.0 for completeness' sake.