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biac:backup [2011/03/31 14:49]
127.0.0.1 external edit 		biac:backup [2014/08/04 16:03]
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 All BIAC users should have plans to back up their data to protect against disk failures.  This page outlines what data BIAC backs up automatically for you, and lists some strategies that you can use to back up the rest of your data. All BIAC users should have plans to back up their data to protect against disk failures.  This page outlines what data BIAC backs up automatically for you, and lists some strategies that you can use to back up the rest of your data.
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 ====== BIAC Experiment Data Backup Policies ====== ====== BIAC Experiment Data Backup Policies ======
  
 BIAC employs a multi-level data protection strategy, which offers users comprehensive backup and restore options. Though this is a service provided by BIAC, this does not preclude you from implementing your own backup or mirroring strategy, if you so desire. It is always a good idea to back up any and all data that you would be sorry to lose. See below for suggestions. BIAC employs a multi-level data protection strategy, which offers users comprehensive backup and restore options. Though this is a service provided by BIAC, this does not preclude you from implementing your own backup or mirroring strategy, if you so desire. It is always a good idea to back up any and all data that you would be sorry to lose. See below for suggestions.
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 ===== Automatic Archiving of Raw MR Data ===== ===== Automatic Archiving of Raw MR Data =====
  
 All of the raw MRI files that come directly from the MRI scanners (DICOM and P-files) are automatically backed up to tape. These tapes are kept indefinitely.  Note that this does not include the automatically reconstructed data that ends up in your Data directories -- the idea is that these can be regenerated from the raw data if needed. All of the raw MRI files that come directly from the MRI scanners (DICOM and P-files) are automatically backed up to tape. These tapes are kept indefinitely.  Note that this does not include the automatically reconstructed data that ends up in your Data directories -- the idea is that these can be regenerated from the raw data if needed.
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 ===== Automatic Nightly Mirror of Specific Experiment Subdirectories ===== ===== Automatic Nightly Mirror of Specific Experiment Subdirectories =====
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 ===== User-Configurable Snapshots of Experiment Directories ===== ===== User-Configurable Snapshots of Experiment Directories =====
  
-You can request to have snapshots set up for your data directories. A snapshot is a point-in-time, read-only copy of the data in your directory, which only stores changed blocks of data in order to be more space-efficient. A snapshot rule specifies the schedule on which to take the snapshots and how many to save. You can have multiple rules for your data. This allows you to restore old versions of a file or a whole directory in case of accidental deletion or other unwanted changes. By default, there is only one snapshot being saved (taken each night at 11:00 PM). Send an email to [[help@biac.duke.edu]] to request changes to the snapshot rules for your data directories.+You can request to have snapshots set up for your data directories. A snapshot is a point-in-time, read-only copy of the data in your directory, which only stores changed blocks of data in order to be more space-efficient. A snapshot rule specifies the schedule on which to take the snapshots and how many to save. You can have multiple rules for your data. This allows you to restore old versions of a file or a whole directory in case of accidental deletion or other unwanted changes. If you don't let us know what snapshot rules you want, you will get the default rules listed below. Send an email to [[help@biac.duke.edu]] to request changes to the snapshot rules for your data directories.
  
 +==== How to check your snapshots ====
 +Every data directory on Munin has a hidden snapshot directory (called ~snapshot). Inside you will find directories that correspond to your snapshots. Within those snapshot directories, you will find read-only copies of your data as it was when the snapshot was taken. You can restore those files simply by copying them to the desired location. You can also right-click your data directory in Windows Explorer and then click on the ''Previous Versions'' tab to see your snapshots.
  
 +If your data are on Hill or Fatt, you can right-click your data directory in Windows Explorer and then click on the ''Previous Versions'' tab to see your snapshots (also known as shadow copies on Windows).
  
-==== How to check your snapshots ==== +==== Default Snapshot Rules ==== 
-Every data directory on Munin has a hidden snapshot directory (called ~snapshot). Inside you will find directories that correspond to your snapshots. Within those snapshot directories, you will find read-only copies of your data as it was when the snapshot was taken. You can restore those files simply by copying them to the desired location. +If you don't specify any snapshot rules, you will get the following default rules. 
- +  - Snapshot every night at 11:00 PM. Save 4 snapshots. 
-If your data are on Hill or Fatt, you can right-click your data directory and then click on the ''Previous Versions'' tab to see your snapshots (also known as shadow copies on Windows).+  - Snapshot every Sunday night at 11:00 PM. Save 3 snapshots (i.e., 3 weeks).
  
 ==== Example Snapshot Rules ==== ==== Example Snapshot Rules ====
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   - Snapshot every Sunday at 6:00 AM. Save 12 snapshots (i.e., 12 weeks).   - Snapshot every Sunday at 6:00 AM. Save 12 snapshots (i.e., 12 weeks).
   - Snapshot on 1st of every month at 11:00 PM. Save 6 snapshots (i.e., 6 months).   - Snapshot on 1st of every month at 11:00 PM. Save 6 snapshots (i.e., 6 months).
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 ==== Notes ==== ==== Notes ====
-  * The snapshots will take up space in your directory. If your directory gets close to full, the oldest existing snapshots will need to be deleted to free up space.+  * The snapshots will take up space in your directory, unless files are never changed, added or deleted. If your directory gets close to full, the oldest existing snapshots will need to be deleted to free up space.
   * It may be tempting to save 6 months of snapshots, but that will mean that when you delete a file or directory, its space will not be freed for 6 months.   * It may be tempting to save 6 months of snapshots, but that will mean that when you delete a file or directory, its space will not be freed for 6 months.
   * The more files change between snapshots, the more space will be taken up by the next snapshot. On the flip side, if nothing changes between snapshots, the snapshot will take up no space.   * The more files change between snapshots, the more space will be taken up by the next snapshot. On the flip side, if nothing changes between snapshots, the snapshot will take up no space.
biac/backup.txt · Last modified: 2023/02/23 18:43 (external edit)

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