In April 2003, readers of the amanda-user mailing list were asked
fill out and submit a survey form describing their use of the
amanda backup system.  Seventy two (72) responses were received.

What follows is a summarization of the responses describing several
properties of the amanda installations and configuration.



Total Disk Capacity of Clients:

    smallest:    20 GB
     largest:  5000 GB

     13    20 to  100 GB
     22   101 to  200 GB
     16   201 to  500 GB
     12   501 to 1000 GB
      5  1001 to 2000 GB
      6  2001 to 5000 GB


Total Data Currently Stored on Clients Disks:

    smallest:     3 GB
     largest:  4000 GB

     22     3 to   50 GB
     14    51 to  100 GB
     15   101 to  200 GB
     10   201 to  500 GB
      7   501 to 1000 GB
      5  1001 to 4000 GB


Average Size of a Single Backup:

    smallest:    0.3 GB
     largest:   700  GB

     22     0.3 to   10 GB
     11    11   to   20 GB
     22    21   to   50 GB
     13    51   to  100 GB
      8   101   to  200 GB
      1             350 GB
      1             700 GB


Backup Program Used

  72 use gnutar or some tar variant including:
         3  hfstar
         1  nttar
         1  smbtar

  50 use dump or some dump variant including:
         1  e2fsdump
         2  ext2dump
        12  ufsdump
         2  vdump
         1  vfsdump
         2  vxdump
         5  xfsdump


Dumpcycle

   5     0 days
   3     1 days
   1     2 days
   6     3 days
   5     5 days
  34     7 days
  17     8 days -  2 weeks
  10    15 days -  4 weeks
   5    30 days - 75 days
   1     4 months
   1     6 months
   1     1 year
   1  1000 days


Frequency of Backups

   6   1/week
   4   2/week
   4   3/week
   5   4/week
  36   5/week
   6   6/week
  31   7/week
   2   1/month


Type of Compression Used

   1  gpg
  15  none
  17  hw
  31  sw - server
  46  sw - client