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FMS17 Progressive Backup error 791 - what can be done?

Question asked by on Jan 30, 2019
Latest reply on Jan 30, 2019 by

Error reported

FileMaker Server 17.0.2 on <serverName> reported the following event:

2019-01-29 21:25:13.250 +0000 Error 791 <serverName> Error during progressive backup of “<fileName>”, a newer copy will be used or made. Database could not be moved from "file:/C:/Backups/FileMaker/Progressive/IncrementalBackup_2019-01-29_2115/Databases/<fileName>.fmp12" to “filewin:/C:/Backups/FileMaker/Progressive/InProgress_FMS/Databases/”. (20402)


Server spec


Windows Server 2012 R2 Standard

Processor: Westmere E56xx/L56xx/X56xx (Nehalem-C) 2.59 GHz

Installed memory ( RAM): 8.00 GB

System type: 64-bit Operating System, x64-based processor

Pen and Touch: No Pen or Touch input is available for this Display

Drive C

Red Hat Virtl0 SCSI Disk Device

Capacity: 299 GB

Used: 223 GB

Free: 76 GB

Hosted on Azure

FMS Version

Windows FileMaker Server 17.0.2



Error is returned repeatedly by FM Server. Does anyone have any idea why or suggest any steps to take? This issue also happens on another FileMaker Server (version 16) hosted in-house on the same OS by another of my customers.

Many thanks.