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With vSphere 7.0U3d and later, there can be a maximum of 20 concurrent TSDM jobs – backups and restores per ESXi host. Specifically, the limit is set to a maximum of 18 concurrent backup jobs or 16 concurrent restore jobs per host. It is a shared pool in which neither backup nor restores can reach 20, in order to enable other restore and backup jobs to run at the same time accordingly.
With vSphere 7.0U3c, there is a static limit of 10 concurrent backup jobs and 10 concurrent restore jobs per ESXi host.
There can be maximum of 180 concurrent VM operations per vCenter. See more in the section VM Direct Engine considerations.