Preservation Policy

General Policy

Our preservation practices combine local backup, nightly and monthly server replication and use of cloud storage services like Amazon Glacier and S3. Content is typically divided into preservation and presentation copies and monitored via routine checksums.

Supported Formats

When submitting files to the Academic Commons, consider using one of the supported and recommended formats. The longer table below offers a more complete list of file formats and the level of preservation support that they receive.

Supported: The format is recognized. We are reasonably confident that files in this format can be migrated to a future format or standard. This format is recommended whenever it is appropriate for your data.

Known: The format is recognized. We promise to preserve the bitstream as-is. We will consider migrating these files to future formats if it can be done efficiently and effectively.

Unknown: Any file in an unknown format is by definition one that cannot be migrated to a future format. The Academic Commons will preserve the bitstream as-is.

Academic Commons File Support Levels

Description Extensions Level
Audio
AIFF aiff, aif, aifc supported
audio/basic au, snd known
MPEG Audio mpa, abs, mpeg supported
RealAudio ra, ram known
WAV wav supported
Applications
Adobe PDF pdf supported
DWG (Autocad drawing format) known
DXF (Autocad drawing exchange format) known
FMP3 (Filemaker Pro) fm known
GIS ESRI Shape File  shp dbf known
GIS ESRI Export formats e00 known
LateX latex known
MapInfo Formats known
MARC marc, mrc supported
Mathematica ma known
Microsoft Excel xls known
Microsoft Powerpoint ppt known
Microsoft Project mpp, mpx, mpd known
Microsoft Word doc known
Microsoft Visio vsd known
OpenDocument Spreadsheet ods known
OpenDocument Presentaion odp known
OpenDocuments Writer odt known
Photoshop psd, pdd known
Postscript ps, eps, ai supported
SDTS (spatial data trans stand) known
SGML sgm, sgml known
TeX tex known
TeX dvi dvi known
WordPerfect wpd known
Image
BMP bmp known
GIF gif supported
JPEG jpeg, jpg supported
JPEG 2000 jp2 supported
PNG png supported
Photo CD pcd known
TIFF tiff, tif supported
Text (US-ASCII, UTF-8)
Comma-Separated Values .csv supported
GIS GML (xml) known
HTML html, htm supported
Plain Text txt supported
Rich Text Format rtf supported
XML xml supported
Video
MPEG-2 / MPEG-4 AVC mpeg, mpg, mpe, mp4 supported
Video Quicktime mov, qt known
 
Unknown (anything not listed) unknown

If you have questions regarding these formats please contact the Digital Production Lab coordinator Sara Amato. To read more about the digital media preservation, see the Library of Congress Digital Preservation page, and their Sustainability of Digital Formats information.