>Thank you.
>
>>No
>>>
>>>When I need to do some changes to the customer database (SQL Server) I usually make a backup first using SSMS -> Tasks -> Backup. But the database could be used by some users ( VFP 9 application). Can creating this backup while the application may be accessing it, cause data corruption or another kind of a problem? TIA.

The opposite is not true - you should not have any connections to the database while making a restore. But for the backup you it does not matter.