Now that you have created some accounts and entered transactions it's a good idea to perform a backup. Because the file used by KMyMoney is a standard Unix file you can just copy the file to another location to back it up or use the dialog provided by KMyMoney. Using the dialog is the preferred method because if KMyMoney ever starts using other file formats, such as SQL, then it would be much harder to copy the file manually.
To backup your file through KMyMoney Select → menu item and enter the folder where you wish the file to be saved. If the folder needs mounting first and you have the sufficient privileges then check the tick box labeled Mount this folder before backing up and click on .
The file will be saved to the folder specified with the current date appended to the filename so it is easy to see the date the file was backed up.