where i can find to be single user while i back up data?
In Navision there is no need to set the database to single user when creating a backup.
The system works by locking the current version (for a very short time, less than seconds) whilst it works out what the current snapshot should be. It then releases the database, and creates a backup of the current version.
This means that users can post invoices, print reports etc, Simultaneously whilst you are creating the backup.
so? i could use back up without warning to the user first?
because yesterday while i was using the database, my friend was restoring the database
so my application’s hang 
Making a backup it’s different from restoring. Restoring removes all old data and so on. Are you using Native or SQL ?
i’m using sql server database
i couldn’t use single user for backing up database
so i must confirm first to all my friends
while doing backups when u are runningon sql, at one stage navision locks the tables and users might lose of the changes they were making. experienced it couple of times
a week ago, while i was backing up navision database
my friend couldn’t post invoice…