Changed webmin temporary dir, backup failing, no log.


My server is getting short of HD space on / mount, and I had no temporary space to store remote backups as they are done.
So I’ve changed webmin’s temporary dir to /home/.webmin

But now, backup is failing and when I go to backup logs there is no log at all.
I can see on the remote servers that 85% of the domains were transferred. But it did not finish all domains and I don’t know why.

On the /home/.webmin directory I have lots of .pl files like
Also have a directory 41209-virtualmin-2017-11-03, with 3 tar.gz from virtual servers in it:

-rw------- 1 root root 11655743747 Nov 4 14:26
-rw------- 1 root root 13929971964 Nov 4 15:46
-rw------- 1 root root 20429144064 Nov 5 03:50

These domains were not transferred to the remote server.

My system:
System hostname (x)
Operating system CentOS Linux 7.4.1708
Webmin version 1.850
Usermin version 1.690
Virtualmin version 5.05
Theme version Authentic Theme 18.49-8.
Firewall version ConfigServer Security & Firewall 11.04
Time on system Monday, November 6, 2017 9:50 AM
Kernel and CPU Linux 3.10.0-693.2.2.el7.x86_64 on x86_64
Processor information Intel® Xeon® CPU E31240 @ 3.30GHz, 8 cores
Drive temperatures sda: 39°C
sdb: 32°C
System uptime 3 hours, 32 minutes
Running processes 350
CPU load averages 0.79 (1 min) 0.74 (5 mins) 0.84 (15 mins)
Real memory 14.87 GB total / 10.68 GB used
Virtual memory 7.57 GB total / 13.72 MB used
Local disk space 2.72 TB total / 1.02 TB free / 1.70 TB used

Why don’t I have the backup log, so I can see what is causing the problem?
What can I do?

Thank you