I have set max size of the backup to the local disc to 15Gb
?? Do you mean maxfile size? that just limits the size of each BKF file
if you want all backups to only consume 15 GB, you need to set the Disk Space Reserve on the B2D folder(s) properties Remember that Disk Space Reserve means space for Non Backup Exec files
If you are doing Exchange backups with "enable restore of individual items" selected, then GRT backups will not obey the standard OPP rules, but will continue creating new files until the Reserver is met or until the logical volume is full