Recently I started receiving this error after recent update. Usually this doesn’t happen before even though I was constantly using those other apps that are shown as warning here.
I am using Duplicati 2.1.0.2_beta_2024-11-29 with Docker.
Hi @SelfhostCJ,
with .NET8 the default on Linux is now to honor advisory locking of files.
We decided to leave that as the default, as a backup of an open file can in some cases result in a backup copy that contains partial writes, causing the file to be unusable.
The “right” solution to the issue is to setup a snapshot mechanism, so you get a consistent view of the disk, potentially flushing writers before. If you want to go this way, see the page on the snapshot tester utility.
If you prefer to ignore the locks and work more like Duplicati 2.0.8.1 and older, you can set the option --ignore-advisory-locking=true (it can be set globally to work for all backups).
For Docker, you can also consider settting the environment variable:
DOTNET_SYSTEM_IO_DISABLEFILELOCKING=true
Which will ignore any advisory locks from within Duplicati.