Backuppc fills up the disk very quickly. Who faced how to fix it?

Question

Debian

Good afternoon.
Backuppc 3,2,1 has been running for almost 5 years and is happy with everything, but some strange things have started happening lately.
The disk on LVM, the reiserfs partition, was originally 150GB.
Because only 10-12 machines have to be reserved, the partition was enough for a long time. After 4 years, I increased it by 100GB and in about six months they were all used up, while only one host was added for backup ..
And so, before the weekend I added another + 400GB and today it writes that there is no free space again.
At the same time, according to bakuppc, the pool size is only 120GB.
General information about the server:
The servers PID is 18710, on host nas, version 3.2.1, started at 9/26 15:09.
This status was generated at 9/29 14:58.
The configuration was last loaded at 9/26 15:09.
PCs will be next queued at 9/29 16:00.
Other info:
0 pending backup requests from last scheduled wakeup,
0 pending user backup requests,
1 pending command requests,
Pool is 120.52GB comprising 3479114 files and 4369 directories (as of 9/29 13:39),
Pool hashing gives 140 repeated files with longest chain 36,
Nightly cleanup removed 86912 files of size 0.70GB (around 9/29 13:39),
Pool file system was recently at 100% (9/29 14:57), today's max is 100% (9/29 09:42) and yesterday's max was 90%.
DF:
/dev/mapper/ALL-backups 653G 653G 0 100% /DISK/backups
Actually the question .. What could be the problem, who eats up the place and what to do?

Answer 1

apt-get install ncdu
ncdu -x /DISK/backups

It will help you
Instead of apt-get, substitute your package manager

Answer 2

Thanks for the utility, I did not know about this.
Maybe for this you need to create a new topic, but suddenly it's somehow connected .. launched ncdu, and it counts on this section for a very long time .. 5K files in total per minute, and there should be about 4M of them there.
Is this a normal speed? Or is something wrong?
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One of the hosts that was backed up was a hosting server, it had a site where a directory with a video archive was connected via a symlink. It was quite funny to discover this.
Thank you very much