Hi, can you please define what you mean by “clients” if you meant you have a customer, you’re violating the EULA of the free edition. Just wanted to make you aware.

Have a look at the logs (c:\programdata) and gather the error information from the Veeam subdirectory that contains your agent backup job.

Hello ​@simonneal72 ,

has the C: drive and the drive the backup is saved enough free space?

Did you have a look at the Windows system logs?

Application Failed is very generic. I'd recommend checking the job logs located under “C:\ProgramData\Veeam\Endpoint” and that should give you more context of the failure 

Hello,

I’ve encountered a similar issue in the past.

20/02/2025 14:54:41 :: Error: Failed to connect to agent 'proveeam01', EP '192.168.x.x:2503'. A connection attempt failed because the connected component did not respond correctly after a period of time, or the established connection failed because the connected host did not respond 192.168.x.x:2503

20/02/2025 14:06:06 :: Error: Application error
20/02/2025 14:08:36 :: Processing finished with errors at 20/02/2025 14:08:36

In my case, it happened with agent backups communicating over a VPN. The problem was related to the firewall. 

You can share with us the logs to better assist. However, in your case, I recommend opening a support ticket so they can assist you further.

Hi 

The issue was --vdisk_corrupted error.

I ran chkdsk repair a few times as per https://forums.veeam.com/veeam-agent-for-windows-f33/vdisk-corrupted-solved-t91675.html

Even though Chkdsk was not reporting errors, it fixed it.

Thanks

My trust in this disk would be shattered….

I would move all data from it and see that I get either a new disk or delete and redefine the virtual disk.

In most cases this is only the beginning of the problems with this disk.