Act server install caused SQL VSS writer error

Recently installed Act! on a client’s existing SQL server and from that point on backing up the VM (using Veaam) failed with a VSS writer error that can be summarised as “Failed to create VM recovery checkpoint (code 32768)”

Running vssadmin list writers showed the SQLServerWriter in a non-retryable state, and simply restarting this service rectified that issue, but I was keen to identify any other issues and then stumbled across a Veeam KB article that specifically references Act! (albeit relating to an earlier version of Veeam B&R) and implemented the suggested change:

Open SQL Server Configuration Manager.
Navigate to SQL Server Services.
Select an appropriate instance (e.g., SQL Server(ACT7)).
Change Log On from Built-in account: Local System to Built-in account: Local Service

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