Client Backup Failed on Server 2019

Hi I have setup a client on a Server 2019 box to backup five folders.
The backups fail continuously with the error below.
I have rebooted the server and the first backup completes but all subsequent backups fail.
Running from a private Appliance with the latest updates.
I have tried removing the client and setting it up as a new client, but same result.
Any help is appreciated, thank you.

Report:
( 38 infos, 2 warnings, 3 errors)

2021-11-23 05:57:24(info): Starting scheduled incremental file backup…
2021-11-23 06:00:47(info): Component caption= name=SERVER\KAV_CS_ADMIN_KIT
2021-11-23 06:00:47(info): Component caption= name=SERVER\KAV_CS_ADMIN_KIT
2021-11-23 06:00:47(info): Component caption= name=SERVER\KAV_CS_ADMIN_KIT
2021-11-23 06:00:47(info): Component caption= name=SERVER\KAV_CS_ADMIN_KIT
2021-11-23 06:00:47(info): Component caption= name=SERVER
2021-11-23 06:00:47(info): Component caption= name=SERVER
2021-11-23 06:00:47(info): Component caption= name=SERVER
2021-11-23 06:00:47(info): Component caption= name=SERVER
2021-11-23 06:00:47(info): Component caption= name=SERVER
2021-11-23 06:00:47(info): Component caption= name=SERVER
2021-11-23 06:00:47(info): Component caption= name=SERVER
2021-11-23 06:00:47(info): Component caption= name=SERVER
2021-11-23 06:00:47(info): Component caption= name=SERVER
2021-11-23 06:00:47(info): Scanning for changed hard links on volume of “c:”…
2021-11-23 06:00:47(info): Indexing of “Folder 1” done. 1 filesystem lookups 40 db lookups and 0 db updates
2021-11-23 06:00:47(warning): Restarting shadow copy of E:\ because it was started by this server
2021-11-23 06:00:47(info): Scanning for changed hard links on volume of “E:”…
2021-11-23 06:00:47(info): Indexing of “Folder 2” done. 1 filesystem lookups 6 db lookups and 0 db updates
2021-11-23 06:00:47(info): Indexing of “Folder 3” done. 1 filesystem lookups 6 db lookups and 0 db updates
2021-11-23 06:00:47(info): Indexing of “Folder 4” done. 1 filesystem lookups 7 db lookups and 0 db updates
2021-11-23 06:00:47(info): Indexing of “Folder 5” done. 1 filesystem lookups 40 db lookups and 0 db updates
2021-11-23 06:00:48(info): SERVER: Loading file list…
2021-11-23 06:00:48(info): SERVER: Calculating file tree differences…
2021-11-23 06:00:48(info): SERVER: Creating snapshot…
2021-11-23 06:01:00(info): SERVER: Deleting files in snapshot… (322)
2021-11-23 06:01:01(info): SERVER: Deleting files in hash snapshot…(2455)
2021-11-23 06:01:01(info): SERVER: Indexing file entries from last backup…
2021-11-23 06:01:01(info): SERVER: Calculating tree difference size…
2021-11-23 06:01:01(info): SERVER: Linking unchanged and loading new files…
2021-11-23 06:03:20(error): Removing snapshot on “SERVER” for path “Folder 1” failed: FAILED
2021-11-23 06:03:20(warning): Writer WIDWriter has failure state VSS_WS_FAILED_AT_BACKUP_COMPLETE with error S_OK
2021-11-23 06:03:20(error): Client SERVER went offline.
2021-11-23 06:03:22(info): Waiting for file transfers…
2021-11-23 06:03:25(info): Waiting for file hashing and copying threads…
2021-11-23 06:03:27(info): Waiting for metadata download stream to finish
2021-11-23 06:03:27(info): Writing new file list…
2021-11-23 06:03:27(info): Number of copied file entries from last backup is 1949
2021-11-23 06:03:28(info): Transferred 23.4534 MB - Average speed: 1.28674 MBit/s
2021-11-23 06:03:28(info): (Before compression: 105.584 MB ratio: 4.50185)
2021-11-23 06:03:28(info): 407.517 MB of files were already present on the server and did not need to be transferred
2021-11-23 06:03:28(info): Time taken for backing up client SERVER: 6m 3s
2021-11-23 06:03:28(error): Backup failed