Create a multivolume backup not working

[VojkanC]

In backup manager even when I check Create a multivolume backup Plesk creates single file backup.
I've tried lowering split limit to 50MB, but again Plesk creates only one backup file larger than 50MB.
What is the problem with splitting backup files? What am I doing wrong?
Please take a look at attached image.

 

[IgorG]

Try to find mentions of split in backup logs /var/log/plesk/PMM/backup... and check value of this split parameter there.

 

[VojkanC]

Thank you for the fast reply.
This is the part of code with split (I've set split to 100MB and once again backup file is more than 300MB):
[23412]: 2015-08-11 12:51:46 DEBUG FILE storage initialized.
[23412]: 2015-08-11 12:51:46 DEBUG Base directory: /var/lib/psa/dumps
[23412]: 2015-08-11 12:51:46 DEBUG Space reserved: 31457280
[23412]: 2015-08-11 12:51:46 DEBUG Gzip bundles: yes
[23412]: 2015-08-11 12:51:46 DEBUG Bundle split size: 104857600

I couldn't find anything that might explain file wasn't split.

Main problem is that when I upload all mine content to VPS, the size of its backup will be at least 5GB, and Plesk backup restore can't accept files larger than 2GB.