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Veeam backups failing with network errors

I use Veeam Free and recently started getting network errors when trying to perform any backups. My destination is a linux box via samba, to an SMR disk with BTRFS – which can be quite unpredictably slow.

Errors included:

Error: Agent: Failed to process method {Transform.Patch}: An unexpected network error occurred. Failed to flush file buffers. File: [\\Redacted\Backup Job 2018-07-04T153041.vbk].

Error: An unexpected network error occurred. Failed to write data to the file [\\Redacted\Backup Job 2018-10-12T140141.vbk]. Agent failed to process method {Stg.RemoveOrphanedSessionKeys}.

Full backup file merge failed Error: Agent: Failed to process method {Transform.Patch}: An unexpected network error occurred.

Full backup file merge failed Error: An unexpected network error occurred. Failed to rename file from [\\Redacted\Backup Job.vbm_tmp] to [\\Redacted\Backup Job.vbm]. –tr:Error code: 0x0000003b –tr:FC: Failed to rename file from [\\Redacted\Backup Job.vbm_tmp] to [\\Redacted\Backup Job.vbm]. –tr:Failed to call DoRpc. CmdName: [FcRenameFile].

Very simple solution, in admin powershell:

Set-SmbClientConfiguration -SessionTimeout 600

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