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biac:backup [2013/02/13 21:37]
favorini Added default snapshot policy
biac:backup [2019/11/14 18:01]
favorini Remove ref to Fatt and Hill
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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 ==== ==== 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. +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 File 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 and then click on the ''​Previous Versions''​ tab to see your snapshots ​(also known as shadow copies on Windows).+
  
 ==== Default Snapshot Rules ==== ==== Default Snapshot Rules ====
-If you don't specify ​snapshot ​policy, you will get the following default rules.+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.   - Snapshot every night at 11:00 PM. Save 4 snapshots.
-  - Snapshot every Sunday night at 11:00 PM. Save 3 snapshots(i.e., 3 weeks)+  - 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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 ==== 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: 2019/11/14 18:01 by favorini