copy vs backup

Hewlett-packard Openview network node ma...
June 11, 2010 at 10:39:16
Specs: Windows XP
Hello,

what is the difference between a copy and a backup of a file in open vms?


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#1
June 15, 2010 at 08:54:06
If You mean
copy dev1:[dir...]filespec dev2:[dir2...]
vs.
backup dev1:[dir...]filespec dev2:[dir2...]

there is not much difference, except different behaviours for modification dates and security settings (protection,ACLs).
And copy by backup can exclude alias files from multiple copies (/NOALIAS), and does not copy content of files set NOBACKUP (unless /ignore=nobackup).

But backup of course does much more than copying files:
create backup archives (save-sets) on disk or tape,
disk-image backups either disk-to-disk or disk-to-saveset, preserving volume-structures, and "bootability".

Joseph Huber, http://www.huber-joseph.de
ITRC


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#2
September 10, 2010 at 05:56:00
Please note that COPY is record based where BACKUP is block based. This is seen as a performance difference where BACKUP will tend to perform faster than COPY. This is only when BACKUP is used to move between directories or disks. When transferring files in general, BACKUP will tend to be faster. IT may not be noticed unless the files are sufficiently large however.

Dan


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