System admins I've noticed, get rather perturbed when unnecessary files are left out on a server when a backup is taken; actually the same goes for snapshots, especially snapshots with memory / machine state.
All of these things are unnecessary when it comes time to take a backup; mainly because they either increase the size of the backup on the backup server, fill up a virtual or actual hdd or because they prevent a backup from being taken...
Is there higher-level abstract terminology or slang for this or is it just that which I've mentioned above.
Data Retention Policy:
The possible terms for files that you want to exclude from your backups are:
exclusions or exclusion set or exclusion list
The possible terms for files that you want to include in your backups are:
file set or selection set or selection list
Note that this is not a complete or all encomapassing list of possible terms