Error completing `gwcmd` CLI gateway backup restoration

Hi,

I'm running Ignition 8.0.10 on Ubuntu 18.04 LTS servers and VMs and am having trouble restoring a .gwbk file through the /usr/local/bin/ignition/gwcmd CLI utility on both.

I can restore a backup well through the gateway web portal but when I execute the command sudo /usr/local/bin/ignition/gwcmd --restore mf_ignition_gateway_backup_2020_04_06__07_00_01_UTC.gwbk --promptyes --disabled I get the following message and the gateway stays in its old state.

Restoration success message was not received from the Gateway. Will attempt to place a __restore.gwbk file in the data folder.
mf_ignition_gateway_backup_2020_04_06__07_00_01_UTC.gwbk

I am unable to find the __restore.gwbk file it mentions and don't notice any abnormalities in the more recent entries in the wrapper.log file shown below. You can see the various attempts I made to restore a backup.

INFO | jvm 1 | 2020/04/06 16:39:58 | I [g.ModuleManager ] [16:39:58]: Starting up module 'com.inductiveautomation.opcua.drivers.modbus' v6.0.10 (b2020031912)... module-name=Modbus Driver
INFO | jvm 1 | 2020/04/06 16:39:59 | I [g.InternalDatabaseManager ] [16:39:59]: Upgrading schema for module "com.inductiveautomation.opcua.drivers.modbus" module-name=Modbus Driver
INFO | jvm 1 | 2020/04/06 16:39:59 | I [g.InternalDatabaseManager ] [16:39:59]: Upgrading schema for module "com.inductiveautomation.opcua.drivers.modbus" module-name=Modbus Driver
INFO | jvm 1 | 2020/04/06 16:39:59 | I [g.ModuleManager ] [16:39:59]: Restarting module "com.inductiveautomation.opcua.drivers.modbus"
INFO | jvm 1 | 2020/04/06 16:39:59 | I [g.ModuleManager ] [16:39:59]: Shutting down module 'com.inductiveautomation.opcua.drivers.modbus' v6.0.10 (b2020031912)... module-name=Modbus Driver
INFO | jvm 1 | 2020/04/06 16:39:59 | I [g.ModuleManager ] [16:39:59]: Shutdown of module "com.inductiveautomation.opcua.drivers.modbus" completed in 5 ms module-name=Modbus Driver
INFO | jvm 1 | 2020/04/06 16:39:59 | I [g.ModuleManager ] [16:39:59]: Starting up module 'com.inductiveautomation.opcua.drivers.ablegacy' v5.0.10 (b2020031912)... module-name=Allen-Bradley Driver
INFO | jvm 1 | 2020/04/06 16:39:59 | I [g.ModuleManager ] [16:39:59]: Starting up module 'com.inductiveautomation.opcua.drivers.modbus' (v6.0.10 (b2020031912))...
INFO | jvm 1 | 2020/04/06 16:39:59 | I [g.ModuleManager ] [16:39:59]: Starting up module 'com.inductiveautomation.opcua.drivers.modbus' v6.0.10 (b2020031912)... module-name=Modbus Driver
INFO | jvm 1 | 2020/04/06 16:40:00 | I [g.ModuleManager ] [16:40:00]: Starting up module 'com.inductiveautomation.reporting' v5.0.10 (b2020031912)... module-name=Reporting
INFO | jvm 1 | 2020/04/06 16:40:00 | I [IgnitionGateway ] [16:40:00]: Ignition[state=STARTING] ContextState = RUNNING
INFO | jvm 1 | 2020/04/06 16:40:00 | I [IgnitionGateway ] [16:40:00]: Gateway started in 38 seconds.
INFO | jvm 1 | 2020/04/06 16:40:32 | W [g.LicenseManager ] [16:40:32]: Could not read license from HASP key. Driver not found
INFO | jvm 1 | 2020/04/06 16:44:22 | I [P.InternalDatabase ] [16:44:22]: Creating auto-backup of internal database "config.idb"...
INFO | jvm 1 | 2020/04/06 16:44:22 | I [P.InternalDatabase ] [16:44:22]: Created auto-backup of internal database "config.idb" in 66 ms
INFO | jvm 1 | 2020/04/06 16:55:11 | I [GcuInterface ] [16:55:11]: Received RestoreGatewayBackupRequest
INFO | jvm 1 | 2020/04/06 16:55:13 | I [GcuInterface ] [16:55:13]: Returning RestoreGatewayBackupResponse (2319ms)
INFO | jvm 1 | 2020/04/06 17:00:28 | W [ClockDriftDetector ] [17:00:28]: Clock drift, degraded performance, or pause-the-world detected.
INFO | jvm 1 | 2020/04/06 17:00:28 | Max allowed deviation=1000ms, actual deviation=1415ms
INFO | jvm 1 | 2020/04/06 17:08:10 | I [GcuInterface ] [17:08:10]: Received RestoreGatewayBackupRequest
INFO | jvm 1 | 2020/04/06 17:08:10 | I [GcuInterface ] [17:08:10]: Returning RestoreGatewayBackupResponse (6ms)
INFO | jvm 1 | 2020/04/06 17:08:26 | I [GcuInterface ] [17:08:26]: Received RestoreGatewayBackupRequest
INFO | jvm 1 | 2020/04/06 17:08:26 | I [GcuInterface ] [17:08:26]: Returning RestoreGatewayBackupResponse (0ms)
INFO | jvm 1 | 2020/04/06 17:10:08 | I [GcuInterface ] [17:10:08]: Received RestoreGatewayBackupRequest
INFO | jvm 1 | 2020/04/06 17:10:08 | I [GcuInterface ] [17:10:08]: Returning RestoreGatewayBackupResponse (1ms)
INFO | jvm 1 | 2020/04/06 17:10:22 | I [GcuInterface ] [17:10:22]: Received RestoreGatewayBackupRequest
INFO | jvm 1 | 2020/04/06 17:10:22 | I [GcuInterface ] [17:10:22]: Returning RestoreGatewayBackupResponse (0ms)
INFO | jvm 1 | 2020/04/06 17:17:12 | I [GcuInterface ] [17:17:12]: Received RestoreGatewayBackupRequest
INFO | jvm 1 | 2020/04/06 17:17:12 | I [GcuInterface ] [17:17:12]: Returning RestoreGatewayBackupResponse (1ms)
INFO | jvm 1 | 2020/04/06 17:17:23 | I [GcuInterface ] [17:17:23]: Received RestoreGatewayBackupRequest
INFO | jvm 1 | 2020/04/06 17:17:23 | I [GcuInterface ] [17:17:23]: Returning RestoreGatewayBackupResponse (0ms)

Any thoughts? Not sure if there is something obvious I'm missing here or if there are other logfiles I can check for errors.