Error in Event Viewer

elwin68

Hello,

When looking in the Event Viewer at the SQL server every evening the same messages and errors are shown between 22:05:00 and 22:08:00. The following messages are shown for every database:
"I/O is frozen on database <database name>. No user action is required. However, if I/O is not resumed promptly, you could cancel the backup."
"I/O was resumed on database <database name>. No user action is required."
"Database backed up. Database: <database name>, creation date(time): 2003/04/08(09:13:36), pages dumped: 306, first LSN: 44:148:37, last LSN: 44:165:1, number of dump devices: 1, device information: (FILE=1, TYPE=VIRTUAL_DEVICE: {'{A79410F7-4AC5-47CE-9E9B-F91660F1072B}4'}). This is an informational message only. No user action is required."

After the 3 messages the following error message is shown for every database:
"BACKUP failed to complete the command BACKUP LOG <database name>. Check the backup application log for detailed messages."

I have added a Maintenance Plan but these jobs run after 02:00:00 at night.

Can somebody give me a clue how I can get ride of the error messages?
Where can I find the command or setup which will backup all databases and log files at 22:00:00 in the evening?

Thanks in advance.