Yes, setting concurrency to 1 helps me. Will try to run concurrency >1 on th pool and see how it works.
When concurrency > 1 it would be nice to split backups per-host (in case of pool) or per-SR (in case of multiple SRs)

Just found this.
Please, move to "XOA" forum from "Request".
Thank you.

Hello!

I would like to request of feature (or just point me to dome setting in XOA) for Full backup mode on BackupNG.
At this moment XOA create a snapshot of all VMs designated for backup as soon as possible at the beginning of the backup.
It it good for semi-consistent backups of multiple VMs but for the cost of SR space on thick-provisioned SR like LVM or LVMoHBA.
If I want to make a full backup of entire host I have to keep at least one half of every my thick-provisoned SR free. It is ridiculous.

So I'm using home-brewed scripts which creating a snapshots prior to export and delete them as soon as export finished or failed. This way I keep minimal amount of free space and have full backup, however snapshots timestamp are different.

Would you please add an option to create snapshot right before vm-export and delete them as soon as export finished?

Thank you.