At night the client's server (on premises, Windows) was doing a backup and the server was not started in the morning.CLient had to restart the server via Mystandard. As far as I understand the server decided to restart in the middle of the backup process or am I wrong? Why this could happen?:

2018-04-19 03:00:03 /THREAD(14) AutSalesActionVc 42
2018-04-19 03:00:03 /THREAD(14) Exporting old records
2018-04-19 03:00:03 /THREAD(14) failed mark text-backup as complete
2018-04-19 03:00:04 Windows Service version
2018-04-19 03:00:04 Starting application...
2018-04-19 03:00:04 20547 cache sectors added
2018-04-19 03:00:04 16384 hash table entries added
2018-04-19 03:00:04 *** running with new mail receiving and parsing ***
2018-04-19 03:00:04 *** Using LRU Replacement ***
2018-04-19 03:00:04 Ankstesnis veiksmas nebuvo reikiamai užbaigtas
2018-04-19 03:00:04 *** using a freelist to keep track of free space ***
2018-04-19 03:00:04 *** RELOAD UI FULLY ***
2018-04-19 03:00:04 *** RELOAD LANGUAGES ***
2018-04-19 03:00:05 Database ID is: 12E7AE4087D3410F68735B9D24A276BE
2018-04-19 03:00:05 Listening on port: 1200 (Clients)
2018-04-19 03:00:05 Listening on port: 1080 (HTTP)
2018-04-19 03:00:05 Listening on port: 1443 (HTTPS)

2018-04-19 03:00:05 Server process running

2018-04-19 03:00:05 8.4 2017-12-09 (build 84191013)
2018-04-19 03:00:05 /THREAD(4) Starting Mail sender
2018-04-19 03:00:05 Server process running, pid 2120
2018-04-19 03:00:09 *** RELOAD UI FULLY ***
2018-04-19 03:00:09 *** RELOAD LANGUAGES ***
2018-04-19 03:00:09 /THREAD(13) Pašto dėžučių peržiūra 7

...
2018-04-19 03:00:10 /THREAD(13) Exporting old records
2018-04-19 03:00:10 /THREAD(13) failed mark text-backup as complete