Export Error for data

From backup window when i tried to make export for the data from specialist date the result was not correct
the new created file are including transactions befor the selected date.

There is no date selection in the backup function for businesses. It will backup all that the business contains. Also note that Manager is a perpetual accounting system and thus the balance sheet and therefore also P&L data will always be present.

I’am Not speaking about backup but speaking about EXPORT

You literally wrote:

I too have seen this, it’s in the bottom right (manager desktop). I think it’s just a relic of an older version, as it’s never worked to my knowledge

Manager does not have an export function. Only copy to clipboard.

Yes, it was in versions years ago. Please note FAQ - Manager Forum where it says [emphasis added]:

Manager advances very quickly, simplifying and adding features and capabilities. Sometimes, bugs occur with new releases. But these are usually fixed rapidly, often within minutes. So if you encounter a problem with the desktop or server editions, update Manager , even if you recently did. (The cloud edition is always up to date.) You can check the latest version at https://www.manager.io/desktop/download/ .

Also:

Be specific. Do not just tell us a feature does not work. Explain what you have done and why you think there is an issue. If your question relates to an apparent software problem (rather than an accounting topic), tell us your operating system (including the version), Manager edition (desktop, server, or cloud), and exactly what you think is wrong. If possible, post screen shots illustrating the problem.

See Company Data Spliting - #3 by VACUUMDOG
A work in progress according to lubos in April last year so not that old…