I asked about this issue from my datacenter they said:this is normal behavior since you have
incremental backups meaning that on monday it will do a full 27gig backup of your system and the rest of the week it will backup only the data that changed that day and adds it to the previous backup of 27gig So at the end of the week you will end up with a bigger backup then 27gig It's perfectl normal

do you think it is normal too?