A NAS snapshot can help only when an appropriate snapshot already exists and contains the required earlier state. Creating a snapshot now preserves the current state, not a file that was already missing. Start by finding a pre-loss candidate and deciding whether you need one file, one folder or a larger rollback.
Establish the snapshot’s scope
Identify the NAS, volume, shared folder and snapshot time. Confirm that the account is permitted to inspect or restore it. A snapshot of another volume or a date after the loss may be irrelevant even when the feature is working correctly.
Snapshots, recycle bins and independent backups should not be treated as interchangeable. A recycle area may hold deleted items from supported deletion routes. A snapshot represents an earlier storage state. An independent backup may remain available when the source storage itself fails. Check each actual copy rather than deciding from its label alone.
Browse before restoring
Use the NAS’s supported snapshot browser or access method to inspect the needed path. Locate the right version and, where available, copy it to a separate location for inspection. For a project, include the dependent media, linked files or database components required by the application.
Record which snapshot supplied the candidate. Open it in the intended application and compare its content with the required work. A filename and timestamp are not enough to establish the correct version.
On Synology, use the installed version’s snapshot-file recovery route to browse a selected snapshot in File Station. On QNAP QTS, an administrator can use the File Station snapshot directory or snapshot file browser. In either case, select the earlier snapshot, navigate to the needed file and copy it to a separate destination when that option is available. Read the final action and destination carefully: Restore can replace current files, while a volume rollback affects a wider scope.
Avoid an unnecessarily broad rollback
Restoring an entire share or volume can affect work created after the snapshot. Before approving that operation, identify the affected users and preserve current content that must remain. If only one file is missing, extracting that file may be preferable to replacing the whole current state.
Keep the recovered candidate separate until you have checked it. Do not delete newer snapshots or clear recycle areas merely to simplify the list during an incident. Those copies may contain versions needed by someone else.
If no snapshot contains the file
Check recycle-bin and independent-backup routes. If none supplies the content, a storage scan is a different operation with its own access and readability requirements. It cannot retroactively generate a snapshot.
For XRecovery’s documented remote NAS route, establish SSH with root access and the supported readable storage configuration. Do not interpret snapshot support in the NAS itself as proof that a recovery application understands every snapshot, compression or storage-pool feature. Preserve the original storage and save any exports elsewhere.
Finish by recording the restored file’s source, checks and remaining gaps. After checking the extracted files, preserve an independent copy before changing the NAS storage pool.
For the next step, see NAS Data Recovery: Start with the Copy You Can Still Access.