Nextcloud backup of 3GB new files takes 6h to complete

Hello everyone. I have completed the 10th revision of my Nextcloud backup. The servers are connected in the follwing fashion: A wireguard tunnel is established and the backup server’s smb share is connected to Duplicacy. Maximum throughput is about 4MB/s with a latency of 50ms. The data sits on two 4TB 7200RPM JBOD drives.
The command options are: -stats -threads 4
Global options: -d -log

The nextcloud backup has the following exclusions:

  • -username/cache/*
  • -updater-ocbxbalrzn4t/*
  • -files_external/*
  • -appdata_ocbxbalrzn4t/*

The verbose output upon completion is:

2021-02-26 21:28:28.861 DEBUG SNAPSHOT_CLEAN Delete cached snapshot file Nextcloud/9 not found in the storage
2021-02-26 21:28:28.862 TRACE LIST_FILES Listing chunks/
2021-02-26 21:28:28.862 INFO BACKUP_END Backup for /mnt/user/appdata/Duplicacy/NextcloudRead at revision 10 completed
2021-02-26 21:28:28.863 INFO BACKUP_STATS Files: 156744 total, 1035G bytes; 131364 new, 914,929M bytes
2021-02-26 21:28:28.863 INFO BACKUP_STATS File chunks: 215272 total, 1037G bytes; 506 new, 3,398M bytes, 3,347M bytes uploaded
2021-02-26 21:28:28.863 INFO BACKUP_STATS Metadata chunks: 27 total, 117,190K bytes; 27 new, 117,190K bytes, 42,304K bytes uploaded
2021-02-26 21:28:28.863 INFO BACKUP_STATS All chunks: 215299 total, 1037G bytes; 533 new, 3,512M bytes, 3,389M bytes uploaded
2021-02-26 21:28:28.863 INFO BACKUP_STATS Total running time: 06:31:09
2021-02-26 21:28:28.863 WARN BACKUP_SKIPPED 1 file was not included due to access errors

Why does it take so long to complete? If you need further information I’m happy to provide.