Chapter 16. HSM for Windows V5.4 209
When original files are replaced by stub files, the stub files themselves are backed up by the
Tivoli Storage Manager backup-archive client when a full backup or an incremental backup is
initiated, because the files have changed. They became stub files. Stub files are backed up
again if the Tivoli Storage Manager server determines that the stub file has changed (for
example, security attributes for the existing stub have changed).
You should review your actual backup policies when stub files are backed up, because the
stub file may cause a new active version of the file on the Tivoli Storage Manager server. It
may be necessary to increase the number of existing versions (VEREXISTS) for your backup
policies ...