Fehler beim Backup 0x40019

Hi,

nearly every backup failed.

I try to backup my itunes database on a network share. The itunes is not running except the normal background services.

For testing i backuped a single file also to the network share - it works; so i do not assume a permisson problem.

I the past the backup works fine but since one or two month i got this error. From my point of view nothing was changed on the system - so I have no idear what the problem could be.

On the way to find a solution i checked the knowledgebase but find nothing.

So I need help!! What is needed to help me?

Best regards
Thomas
Here's the errorlog:

Fehler beim Backup. (0x40019)
Tag = 0xCE542E14DA203B82
Fehler beim Backup. (0x40019)
Tag = 0xCE542E14DA203AC3
Zugriff auf die Datei oder den Ordner wurde verweigert. (0x40014)
function = "CreateFileW",
filename = "\\?\UNC\192.168.135.3\daten\itunes-backup\ITUNES_full_b1_s1_v1.tib"
Tag = 0xA8A1022BD18AE056
Der Prozess kann nicht auf die Datei zugreifen, da sie von einem anderen Prozess verwendet wird (0xFFF0)
code = 80070020)
Tag = 0xBD28FDBD64EDB8C3