mass-storage/mass-storage-backup-archive.md

@@ -31,7 +31,24 @@ when large number of small files are created or modified (e.g. several thousands
 
 For files that do not require to be backed up, such as temporary files, a specific folder can be created. This folder must be called "nobackup". It must be written exactly like this, without space and in lowercase. Otherwise it will still be backed up. 
 
-# Data archiving procedure
+# Data archiving
+
+Since the space on the mass storage is finite and expensive and that we are producing more and more data, a user can now send files to an archiving (tape) library to release some space on the mass storage. Moreover, as explained in the [quota](mass-storage/mass-storage-quota) and [billing](mass-storage/mass-storage-billing) pages, a part of the space of the mass storage will be charged. Moving data to the archiving (tape) library could help reduce the bill. The files sent to this archiving (tape) library should be files that the user needs to keep (for legal reasons for example) but do not need to use/access quickly anymore.
+
+Currently, data are present in several copies (one on the mass storage located at the GIGA and two copies on tape at the SEGI). In January 2021, there will be an addition of a new tape library at the CHU datacenter. Two new copies of the data will thus be created at this location.
+ In total, the data will be present in two copies at each locations (SEGI and CHU datacenter).
+
+NB: Tape libraries are for long term storage of data (more stable but slower in term of writing/reading capacity).
+
+**IMPORTANT**: Due the finite space on the mass storage, some files may be sent to archiving even if the user does not ask for it. See the [automatic archiving](mass-storage/mass-storage-backup-archive#automatic-archiving).
+
+
+
+## On demand archiving
+
+The final system is not yet implemented (it will be available during August). However, a page describing how to properly organize your data is already available [here](mass-storage/mass-storage-archive-creation).
+
+## Automatic archiving
 
 Once the server will reach 80% of its maximum storage capacity, oldest data will automatically be truncated from the disk in order to save space. Once that happens, there will still be 2 copies of the file on tape but only the beginning of the file and its metadata will stay on disk. Therefore, the file name will still be visible in the tree view but the file itself will be on tape.