I'm not convinced it would be usefull : if nobody know the method to retreive my backups + I see no functionalities in Odoo.sh to do that, I'm not optimistic at all. And furthermore it was a test : It is not worth to try to "move Odoo support" for that.

OK. It's up to you. But if you have a real problem with a dababase hosted by Odoo it's the proper way to get support.
I've been told, in fact, that you can retrieve a backup from a Saas database by asking for it this way.

ok, but the matter is exactly what you pay : I think that Odoo is cheaper that its competitors, is n't it ?
and if you need a better support, you can work with an Odoo integrator to support you .... I know at least a good one ....

It's not all down to what you pay. Just because it looks cheaper on paper doesn't mean it is and the product is flawed with stupid simple things that should be happening on a v17 a product. Header & Footers for invoice not working despite installing specific versions of other software. Basic functionality just doesn't work properly. Then you're expected to "work with a partner" yeah great. Then it certainly is not cheaper than other better solutions out there. I don't even get a response to questions like "does this work in the enterprise version". I don't want to use their cloud I want self hosted and am forced to pay upfront for it on the off chance the many issues might be fixed in that version... Just bad customer service. I'm evaluating a couple of other products similar and I must say their customer support and even community support is leaps and bounds better.

ok, reading your answer, I become very, very anxious about the future of Odoo. About the headers and footers of invoices which don't work in v17.0, I have not tested yet in this version but I am very surprised : do you have tested with odoo online ? because for installation on premices, there was a tricky thing about the version or whtmltopdf library which had to be a particular one. I found that pdf libraries have changed with v17.0, so there may be another tricky thing there, but it will be only on premices instalations. But anyway, I think that I will continue to use Odoo : being an integrator for an ERP with +30% groth per year is a quite comfortable situation ...

I'm sure it works in the online version. I'm not interested in the slightest in the online cloud hosted version as i'm sure many others using this kind of software won't be either. The whole point is if they can't get a standard clean install working out of the box then there is little faith to be had in the product. The experience so far is very poor to be honest. I'm sure you'll stick with it as i'm sure you make good money by fixing things that should work even in a clean install. Once businesses are in the eco system they're pretty much stuck without spending huge amounts to migrate to another system and all that entails.

It's a shame as on the face of it Odoo looks absolutely great. I really like the module system, the website builder is actually pretty good as well. Clearly everything is focused on the online cloud offerings which is a shame.

Building a super strong community edition would only bolster every other part of Odoo but this is unfortunately not the focus. Anway that's my take on it. I've used a lot of systems for many years and have been in the industry for over 25 years working with SAP, Sage, Microsoft, Saleslogix, Navision, Dynamics, Salesforce etc. This could be the killer all in one solution as I believe it was set out to be and I really wanted it to be! I still do to be honest.

The vibe here at the moment is very much, won't help anyone else unless of hours its paid project work and the company doesn't care unless you're subscribing to their online offering. Open source works very well when the community collaborate to make the product as good as it can be. That then ultimately benefits everyone, the company, the resellers, the consultants.

Thanks @youssef, but I think that it is really non-professional from Odoo.sh to behave this way !