My Pgbackrest Backups Take Up Too Much Space

Hi,
I have a 9.3 TB database. And when I take a full backup, the space it
occupies in the repo is 8.7 TB. This compression is not enough for me. It
needs to be compressed more, I did not enter any parameters on my backup
server for compression, so it compresses with default parameters (gz).
Normally gz compresses well, why is there so little compression?

Also my archive files, the two days archive file of my stanza is now 744GB.
I understand that my old archive files are not deleted after my incr
backup. Wouldn't my old archive files be redundant after my incremental
backups, wouldn't it be better to delete them? What is the parameter to
ensure deletion?

*backup info:*

* full backup: 20250215-000009F timestamp start/stop:
2025-02-15 00:00:09+03 / 2025-02-16 03:12:36+03 wal start/stop:
0000000200001FC90000008B / 0000000200001FCF00000061 database
size: 9375.6GB, database backup size: 9375.6GB repo1: backup
size: 8754.4GB incr backup: 20250215-000009F_20250217-020004I
timestamp start/stop: 2025-02-17 02:00:04+03 / 2025-02-17 04:10:25+03
wal start/stop: 000000020000207700000090 /
0000000200002077000000A5 database size: 9392.0GB, database
backup size: 897.7GB repo1: backup size: 712.7GB
backup reference total: 1 full incr backup:
20250215-000009F_20250218-020005I timestamp start/stop:
2025-02-18 02:00:05+03 / 2025-02-18 02:14:59+03 wal start/stop:
0000000200002087000000F8 / 000000020000208800000008 database
size: 9419.4GB, database backup size: 364.8GB repo1: backup
size: 54.4GB backup reference total: 1 full, 1 incr*

As you can see here, there is a noticeable difference only in the last incr
backup.

*This is how much space my archive file takes up:*
*744G main_stanza*

*Backup config parameters:backup
host:[global]repo1-bundle=yrepo1-block=yrepo1-path=/mnt/dbbackuprepo1-retention-full=1process-max=4start-fast=ylog-level-console=infolog-level-file=info*

*[main_stanza]pg1-host=masterpg1-path=/mnt/postgres/13/datapg1-port=5432master
host:[global]log-level-file=inforepo1-host=backupstart-fast=yarchive-async=yprocess-max=2spool-path
=
/var/spool/pgbackrest[main_stanza]pg1-path=/mnt/postgres/13/datapg1-port=5432*