How to make sure consistency when backup a volume?

[DongBeiDaMao]

If an app writes data into the volume when the restic is running, how to make sure the backup data is right?

[hossainemruz]

You can use Stash hooks to freeze the file system before backup and unfreeze after backup.
Ref: https://stash.run/docs/v2021.11.24/guides/latest/hooks/overview/

[DongBeiDaMao]

Thank you for your answer. I've read the ref carefully.
Now I wonder if freezing the file system will affect the use of app when the backup process continues for a long time.