CAEN Knowledge Base
CAEN Knowledge Base

How do I recover a previous version of a file I may have deleted? What is a snapshot?

Snapshots are the place to look to recover a file that you may have deleted accidentally from your online file storage within the last eight weeks. A snapshot is a point-in-time copy of the files and directories at a particular location. Hourly, nightly, and weekly snapshots are available, providing self-service recovery of recently changed or deleted files. You may be able to recover files yourself using snapshots, if your files were deleted or modified less than 18 weeks ago.

Files deleted or modified more than 18 weeks ago cannot be recovered.




How to Recover Files in Windows

Follow these steps to recover a file in your online file storage from a Windows computer:

  1. Go to the folder containing the files you wish to recover.
  2. Right-click on the folder's icon and select Properties.
  3. Click on the Previous Versions tab.
  4. Select the appropriate folder to recover the file from using the Date modified, and click Open.
  5. Copy the files to be recovered to a new location.
  6. Close the snapshot window.

Detailed Instructions

1. Go to the folder containing the files you wish to recover.

Online file storage can be accessed from any CAEN lab Windows computer. For assistance with mounting a network share in Windows, refer to the instructions about How to Access Your Files.

2. Right-click on the folder and select Properties.

Windows File Recovery - Properties

3. Click on the Previous Versions tab.

A list of folders, corresponding to the dates/times of the snapshots will appear in your browser. Note that the snapshots are created twice daily and are retained for eight weeks. If a file is created and deleted within 24 hours, it may not be in a snapshot. If the file was deleted or modified more than eight weeks ago, it can not be recovered.

Windows File Recovery - Versions

4. Select the appropriate folder from which to recover the file using the Date modified, and click Open.

This opens a read-only view of the files and directories as they appeared at that time. You cannot create or delete files or folders in this view. Some file types cannot be opened directly in the snapshot, because temporary files cannot be created in this read-only view; you must copy these files to another location before opening.

5. Copy the files to be recovered to a new location.

The snapshot window provides a read-only copy of files that cannot be modified. You also cannot save files to these folders. If you wish to recover files from the snapshot, you must copy (or drag and drop) them to another location.

6. Close the snapshot window.


How to Recover Files in Linux

Follow these steps to recover a file in your online file storage from a Linux computer:

  1. Connect to smb://engin-storage.m.storage.umich.edu/engin-storage/uniqname.
  2. Select the desired snapshot.
  3. Select the file to be recovered.
  4. Copy the file to new location.
  5. Close the snapshot window.

Detailed Instructions

1. Connect to smb://engin-storage.m.storage.umich.edu/engin-storage/uniqname.

To access the backup copy of any folder in online file storage, add ~snapshot to the server path:

Linux File Recovery - Snapshot

A list of folders will appear in your browser.

2. Select the desired snapshot.

The snapshot folders are named according to retention (i.e. hourly, nightly or weekly) followed by the date and time of creation. Double-click the desired snapshot folder:

Linux File Recovery - Hourly

3. Select the file to be recovered.

This will open a read-only view of the files and folders as they appeared at that date and time. Select the file or folder you wish to recover.

4. Copy the file to a new location.

You cannot create or delete files or folders in this read-only view, and some file types cannot be directly opened in the snapshot since temporary files cannot be created. If you wish to recover files from the snapshot, you must copy (i.e. drag and drop) them to another location.

5. Close the snapshot window.


How to Recovery Files in Mac OS X

Follow these steps to recover a file in online file storage from a Mac OS X computer:

  1. Connect to smb://engin-storage.m.storage.umich.edu/engin-storage/uniqname.
  2. Select the desired snapshot.
  3. Select the file to be recovered.
  4. Copy the file to new location.
  5. Close the snapshot window.

Detailed Instructions

1. Connect to smb://engin-storage.m.storage.umich.edu/engin-storage/uniqname.

To access the backup copy of any folder in online file storage, add ~snapshot to the server path:

Mac OS Recovery - Folders

A list of folders will appear in your browser.

2. Select the desired snapshot.

The snapshot folders are named according to retention (i.e. hourly, nightly, or weekly) followed by the date and time of creation. Double-click the desired snapshot folder:

Mac OS Recovery - Folders

3. Select the file to be recovered.

This will open a read-only view of the files and folders as they appeared at that date and time.

4. Copy the file to a new location.

You cannot create or delete files or folders in this read-only view, and some file types cannot be directly opened in the snapshot since temporary files cannot be created. If you wish to recover files from the snapshot, you must copy (or drag and drop) them to another location.

5. Close the snapshot window.