HP OpenVMS Systems

Performing incremental and full BACKUPs?

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The Question is:

 
re: Backup/record/since=backup
 
I assumed that the command BACKUP/RECORD/SINCE=BACKUP [] [-]$TEST.BCK/SAVE
for example would
backup files in the current directory that are new or have been updated
since the last
backup operation. Is this correct or does every /IMAGE backup require the
/RECORD
qualifier to keep the working correctly. I've noticed that my incremental
backup operation
is backing all files. The backup date is getting modified however the files
are backed up
with each BACKUP/RECORD/SINCE=BACKUP command.
 
What am I missing on incremental backups?
 
Thanks,
Gordon Schmitt
 
 

The Answer is :

 
  Please read the documented procedures for correctly performing BACKUPs
  and incremental BACKUPs -- the BACKUP commands necessary for these
  operations and for full and incremental restorations are included in
  the examples at the end of the BACKUP section of the _System Management
  Utilities Reference Manual_.
 
  In the example "Saves a disk volume for incremental backups for the
  first time", you will find:
 
    $ BACKUP/RECORD/IMAGE/LOG/LABEL=label ddcu: saveset.BCK/SAVE
 
  In the subsequent example "Saves a disk volume for incremental backups
  (not the first time)" you will find:
 
    $ BACKUP/RECORD/FAST/LOG ddcu:[*...]*.*;*/SINCE=BACKUP -
    _$ saveset/SAVE/LABEL=label
 
  You can also eliminate the use of the /RECORD on the incremental pass,
  allowing you to build up a series of incremental tapes.
 
  The following two DCL subroutines are examples from a procedure that can
  perform both an incremental and a full BACKUP.  These examples show how
  you can build up a series of incremental BACKUPs based on the last full
  (/RECORD) BACKUP pass.
 
 
  $INCR: SUBROUTINE
  $ Set NoOn
  $ Reply/All/Bell "Starting Incremental Backup"
  $ Backup -
      Sys$SysDevice:[*...]*.*;*/SINCE=BACKUP -
      tape:XD.BCK/Save/NoRewind -
      /Label=XD/Ignore=(Label)/Verify
  $ Reply/All/Bell "Incremental Backup Done"
  $ Return
  $ EndSubroutine
 
 
  $FULL: SUBROUTINE
  $ Set NoOn
  $ Reply/All/Bell "Starting Full Backup"
  $ Backup -
      Sys$SysDevice:/Image -
      tape:XD.BCK/Save/Rewind -
      /Label=XD/Ignore=(Label)/Verify/Record
  $ Reply/All/Bell "Full Backup Done"
  $ Return
  $ EndSubroutine
 
 
  The Wizard would strongly recommend testing out your full and incremental
  BACKUP restoration process periodically -- preferably before you actually
  need to restore a disk or a specific file.  Testing the process will
  uncover potential documentation and procedural errors, as well as any
  potential errors in the BACKUP procedures themselves, as well as any
  potential problems with the archival media and device(s).
 

  

     

     
answer written or last revised on ( 3-NOV-1998 )
     
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