Bakcup imcomplete

In the last three days our application began to show errors and strange behavior. In reviewing applications ScriptCase some of the applications had lost the last lines of modified code

When reviewing we do daily backups. check that the work was lost about a week.

Anyone ever happened something like this?

For now we will we be doing backup to import another project developed applications and see that the code made is reflected in the support but it is a worrying situation if it becomes repetitive.