How to deal with backup growth in Veeam?

Question

Backup

There is a virtual machine with Centos 7.
Only about 3 gigs are occupied on it.

df -h
Файловая система Размер Использовано  Дост Использовано% Cмонтировано в
/dev/sda2           20G         3,0G   17G           16% /
devtmpfs           489M            0  489M            0% /dev
tmpfs              497M            0  497M            0% /dev/shm
tmpfs              497M          51M  447M           11% /run
tmpfs              497M            0  497M            0% /sys/fs/cgroup
/dev/sda1          497M         136M  362M           28% /boot

But when creating a full backup, a 7.6G file is obtained.
What should be done so that the size does not exceed the occupied disk space?
PS Well, I gave this as an example. But generally the same and on screw virtualka.
One has only to write down some data, then delete it, then the size of the backup increases significantly.

Answer 1

Looks very strange. What platform are you using? Thin/thick rims? Is there exactly one VM in the job? What version of Veeam?