# Advanced filter patterns and wildcard reference - NAS

Use this page for advanced NAS filtering patterns, including snapshot handling and network path behavior.

## NAS wildcard patterns

Pattern | Description | Example | Behavior
--- | --- | --- | ---
`**` | Matches directory levels across NAS paths | `/vol/data/**/cache/*` | Matches folders at any level
`***` | Matches full directory tree | `/share/***` | Filters entire share recursively
`*` | Matches file patterns | `*.log` | Filters files across NAS

## NAS path behavior

Scenario | Behavior
--- | ---
Match full NAS export | Uses recursive directory matching
Match nested directories | Uses multi-level wildcard matching
Match large directory trees | Use `***` for full traversal
Cross-protocol matching | Works across NFS and CIFS paths

## snapshot filtering behavior

Scenario | Pattern | Behavior
--- | --- | ---
NetApp snapshot directories | `**\.snapshot\***` | Excluded automatically
Generic snapshot folders | `**\~snapshot\***` | Excluded automatically
Legacy snapshot folders | `**\~SNAPSHT\***` | Excluded automatically
Override snapshot exclusion | `<BIF,-Snapshots>` | Includes snapshot directories

## NAS-specific advanced scenarios

Scenario | Behavior
--- | ---
Filter entire share efficiently | Use full recursive patterns
Handle snapshot-heavy environments | Keep default exclusions
Avoid duplicate backups | Do not include snapshot paths unless required
Optimize large NAS backups | Use targeted directory filters

## NAS filtering rules

Rule | Behavior
--- | ---
Snapshot handling | Excluded by default
Pattern matching | Applies across all directory levels
Protocol handling | Supports NFS and CIFS
Case sensitivity | Filters are not case-sensitive
Performance | Recursive filters improve efficiency

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