DB backups not secheduled I have done backup plan to backup 1 DB . When  look in the log i can see that the system has taken backup of all databases (master , reportserver ...etc) . However on the drive where data are backed up , i can see only my DB for which i have done the bakup plan .

Questions: 

1) why i am seeing in the log that there were many DB backed up .

2) If 1) is true where are these backups ?

Any comment will help.
The problem was that i was doing a classic  backup using windows server utility  (nothing to have with DB backup) for some folder . I was doing backup for only 1 folder in the root of the C:\ drive  .

But somehow when this backup starts it freezes the I/O on each database, then it resumes the I/O of all databases and finally all DB are backed up .