Sharepoint 2016 backup failure

Hi, i got the initial setup configured by referring to NMM for sharepoint using VSS 9.2 guide. For each server in SP farm, I can see the saveset listed when I execute nsrnmmsv -P but  the primary WFE  backup fails with an error "Failed to send large saveset to SQL server" ..Any suggestions related to troubleshooting in the right direction  is appreciated as I could not find any relevant information in networker or OS event logs. thanks!