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We have SharePoint on-premises farm 2013, and per my knowledge that it is not supported to query the SharePoint databases. but is it a supported operation to select a SharePoint database (for example our manage metadata service database) >> right click on it >> Tasks >> chose to backup >> as follow:-
or this is not supported?
this is supported method, you are safe to perform the backup this way.
Check this link for more details about the same method.
Use SQL Server tools to back up a content database in SharePoint Server
