## [Do I need to pay to store data on the mass storage ?](mass-storage/mass-storage-costs)
The majority of the costs of the mass storage have been covered by a FEDER grant obtained by the GIGA. However, some operating costs are not covered by this grant, such as costs linked to the improvement of the performances, software licenses.
No you don't. However, if you you want to know more about mass storage costs, or if you are applying for a grant for a project that will generate more than 1Tb of data and would like to help improving and increasing the capacity of the GIGA mass storage, please read the [mass storage costs page](mass-storage/mass-storage-costs) of this documentation.
For this reason, the GIGA decided to give to each research team a certain amount of free space on the mass storage, and to charge any additional space used by them.
The revenues from these fees will be used exclusively for costs linked to the mass storage management.
Find more information about this system [here](mass-storage/mass-storage-billing)
## Good practices
## Good practices
### How to reduce disk usage ?
-**Don't keep several copies of files**
-**Don't keep several copies of files**
All files present in your home or project folders on the mass storage are backed up on a tape library situated at the SEGI (B26).
All files stored on the mass storage are backed up on a tape library situated at the SEGI (B26) and another one at the CHU datacentre.
This means that there are two copies of all your files in two different buildings.
This means that there are three copies of all your files in three different buildings.
If backed up properly, you'll be able to retrieve a file accidentally deleted less than 28 days ago.
If backed up properly, you'll be able to retrieve a file accidentally deleted less than 28 days ago.
In some circumstances you will even be able to retrieve a previous version of a properly backed up file. To be sure your files are backed up properly, you should read the [**backup policies**](mass-storage/mass-storage-backup-archive) .
In some circumstances you will even be able to retrieve a previous version of a properly backed up file. To be sure your files are backed up properly, you should read the [**backup policies**](mass-storage/mass-storage-backup-archive) .
-**Use compression tools when possible and group numerous small files in gzip, TAR or DAR archives**
-**Use compression tools when possible** (we recommend to start compressing files when they are bigger than 200Mb) and **group numerous small files in gzip, TAR or DAR archives** (typically, if you have thousands of related small files in the same folder). You'll find more information about how to compress and group files this [page](mass-storage/mass-storage-compression)
You'll find more information about how to compress and group files this [page](mass-storage/mass-storage-compression)
-**Delete temporary/obsolete files** (intermediate files not needed anymore for example)
- Send files you need to keep but do not need to quickly access anymore to the GIGA [**archiving system**](mass-storage/mass-storage-backup-archive#Offline-data-archiving)
### How to keep my data organised ?
-**Keep all the files associated to a project in that project folder and not in your home**
-**Keep all the files associated to a project in that project folder and not in your home**
This will allow all people working on a given project to access these data and work on them. It will also facilitate the upload of the data to public database when submitting a publication.
This will allow all people working on a given project to access these data and work on them. It will also facilitate the upload of the data to public database when submitting a publication.
-**Name files and directories according to the mandatory rules described below**
-**Name files and directories according to the mandatory rules described below**
You'll find more recommendations on data management and file naming [here](mass-storage/mass-storage-management-practices).
You'll find more recommendations on data management and file naming [here](mass-storage/mass-storage-management-practices).
## Mandatory rules for file and folder names
## Mandatory rules for file and folder names
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# [FAQ](faq/FAQ)
# [FAQ](faq/FAQ)
If you don't find the information you are looking for in the above sections, don't hesitate to consult the FAQ.
If you didn't find the information you are looking for in the above sections, don't hesitate to consult the FAQ.
