From CCRMA Wiki
Your home directory is backed up automatically each day to backup server. You can access these daily images by going to:
There, you will see directories with names like '
20070804,' which corresponds to the date of the backup.
Inside this directory you'll see another directory named '
tree' corresponds to your home directory. So, in side it you'll see all the files and dictories backed up on that date. This is an 'image' or snapshot of what your home directory looked like at backup time. Backups are taken sometime between midnight and 8am generally.
You can read from (copy from) these directories, but cannot write to them.
So, if you deleted a critical soundfile from your home directory (e.g.
~/sounds/best-sound-ever.ogg) you could copy that file back into your home directory by visiting the most recent date directory where the soundfile exists and copy it back, somewhere into your home directory, like this:
~> cp /usr/ccrma/backup/<username>/<date-directory>/tree/sounds/best-sound-ever.ogg ~/sounds
The backup images are retained inside a 3 month window according to the following schedule:
|0-2 weeks||2 - 5 weeks||5 - 12 weeks||beyond 12 weeks|
That is, for two weeks back from the present day, you have an image available for each day. Further back than two weeks, but less than five, you have MWF images available (T,Th,Sa, and Su images have been deleted). From five to twelve weeks, you have only each Friday's image available (M and W are deleted), and after twelve weeks, all images are deleted.