User Tools

Site Tools


backup

Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revision Previous revision
Next revision
Previous revision
backup [2011/11/03 10:42]
damir
backup [2015/07/24 09:55] (current)
Line 24: Line 24:
 To offer the maximum support to users, our Network has different method to backup the data. Each method has pros and cons, and not all the method are accessible directly to the users. In some cases the user must ask to the System Administrators to recover his/hers data from the backup devices. This is necessary to maintain a good level of compromise between access to data and security. The backups are complete collections of all the data that **all** users collect and thus we have to consider the access to these repositories carefully. To offer the maximum support to users, our Network has different method to backup the data. Each method has pros and cons, and not all the method are accessible directly to the users. In some cases the user must ask to the System Administrators to recover his/hers data from the backup devices. This is necessary to maintain a good level of compromise between access to data and security. The backups are complete collections of all the data that **all** users collect and thus we have to consider the access to these repositories carefully.
 \\ \\
-We have different level of backup that offer access to deleted/​changed files with different solutions.+We have different level of backup that offer access to deleted/​changed files with different solutions.
  
   * Backup in the **[[backup:​snapshot|.snapshot]]** directory   * Backup in the **[[backup:​snapshot|.snapshot]]** directory
   * Backup on **[[backup:​night|Hard Disk]]** in a central backup sever   * Backup on **[[backup:​night|Hard Disk]]** in a central backup sever
-  * Backup on **[[backup:​night|Tape]]** cartridge in central backup server 
  
  
Line 34: Line 33:
  
 Every user can find inside his/hers homedir on the central filer an hidden directory named **.snapshot**. Inside this directory exists others directories that have name Every user can find inside his/hers homedir on the central filer an hidden directory named **.snapshot**. Inside this directory exists others directories that have name
-  * hourly.[0-3+  * hourly.[0-23
-  * nightly.[0-3+  * nightly.[0-6
-  * weekly.[0-1+  * weekly.[0-3
-As the name suggest, these directory contain the file changed during the **lasts ​hours, ​days and weeks** ​(the 0 **is** something). If the wanted file was deleted/​changed during this time, the user have to search these directories,​ in order to find it. +As the name suggest, these directory contain the file changed during the **lasts ​24 hours, ​days and weeks**.\\ If the wanted file was deleted/​changed during this period of time, the user have to search ​inside ​these directories,​ in order to find it. 
-Pay attention that inside the .snapshot directories a user can see the **state** of his/hers directory how it was, so if you look inside one of these directory you can see not only the files changed, but all the files you have currently. Amazing, isn'​it?​ +If the searched file is found, the users can copy it where it want and the restore is done, the files inside .snapshot subdirs are accessible only in read mode and cannot be changed/​modified/​deleted/​renamed.
-If the searched file is found, the users can copy it where it want and the restore is done.+
  
 ==== Hard Disk in a central backup sever ==== ==== Hard Disk in a central backup sever ====
  
-Every day at 00.30 a backup process copies all the files present in the users directories to another server, accessible only to System Administrators. Stored in this server we maintain the **last 30 days** of all the homedir, so in case of failure of the central file server we can restart with only 1 day of lost.+Every day at 00.30 a backup process copies all the files present in the users directories to another server, accessible only to System Administrators. Stored in this server we maintain the **last 30 days** of all the homedirs, so in case of failure of the central file server we can restart with only 1 day of lost.
 Not vital files aren't backed up. [[backup:​list|here]] you can find the list of files excluded. Not vital files aren't backed up. [[backup:​list|here]] you can find the list of files excluded.
 \\ \\
 To retrieve a file from this server the user must ask it to System Administrators,​ __and please don't forget the details about the file__. To retrieve a file from this server the user must ask it to System Administrators,​ __and please don't forget the details about the file__.
  
-==== Tape cartridge in central backup server ​====+===== Laptops ​===== 
 +Each Laptop managed by the lab is configured to backup all the files on one of 
 +our backup server. this function works only when the laptop is connected to 
 +the EPFL network using a network cable, please connect your laptop at least 
 +once per week to the network using the cable.
  
-Every day there'​s a backup procedure that copies all the files changed **during the day** to a tape cartridge stored on the central server of **Epfl**. Every Sunday night, the backup'​s procedure do a copy of **all** the files present on our File Server. 
 \\ \\
-To access the files stored on tapes the user must ask to the System Administrator that forward his/hers request to the backup ​team of the **Epfl**. The restore of files from tape require a lot of time, but normally is done during the day of request. The tapes are cheaper than the hard disk (and more slower) so we can maintain the data for more time. Currently we can restore the **last 3 months** ​of data, from tape backups.+\\ 
 +Please refer to [[backup:​laptops|this page]] ​for more information about backup ​of laptops
  
-===== Laptops ===== 
-Laptops are the nightmare of any system-manager. Not only they are always a special case, therefore taking the same amount of work as 50 identical workstations,​ but also (and more importantly),​ their backup is under the only responsability of the user. 
-The files on a laptop are much more in danger than those on a workstation or on a file server: the laptop HardDisk is smaller and more fragile, the laptop can get stolen or lost, laptops get into many different uncontrolled networks.... 
-Nevertheless,​ we know that very few users backup their data on a regular basis. ​ 
-As Laptops become more and more convinient to use, the important work data also becomes more and more in danger. It is useless to have a sophisticated centralized backup system as the one described above if users keep their important data on their laptop. So **please backup your work data as often as possible**. Afterall, your work data belongs to EPFL. 
-\\ 
-\\ 
-Please refer to [[backup:​laptops|this page]] for more informations about backup of laptops 
backup.txt · Last modified: 2015/07/24 09:55 (external edit)