Selfhosted
A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control.
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That depends. Some applications and backups are aware of each other, and the application can quiesce to provide the backup a snapshot that won't be modified while it's being read. Sometimes this is done at the filesystem level too. For a VM, capturing the running state accomplishes the same thing (though the server may be surprised when a restore happens and suddenly all the clients are gone).
Bottom line, it depends on the server architecture.