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For both NT and UNIX, we use Gnutar as backup utility. The function of
Gnutar on both platform are identical. (with few minor exceptions,
but the difference will not be noticed at the user level.)
About NT :
>Are they working with the WNT Archive bit?
We do not do anything with WNT archive bit.
>May I issue a backup for files specified by modification/creation time too
It is possible to do so, but ABS does not recommend the users to handle
incremental date specification, because it's a lot of work for the
users to control it. If you let ABS handle FULL/incremental scheduling
and which files are to be in incremental, the operation will be
automatic. The best thing is to specify FULL data movement type and
use one of our complex schedules (such as weekly full daily
incremental).
If you want to specify yourself files with modification/creation time
manually, you have to do a lot of work that ABS does it for you.
>May I control if my save request sets the ARCHIVE
>bit after backing up a file or leaving it unchanged?
ABS does not care what you do with archive bit.
About UNIX backup - we do not use standard TAR. We user Gnutar which
has incremental capability. For both NT and UNIX, incremental is done
as follows ( suppose we use weekly FULL and daily incremental):
Please look into ABS documentation for the incremental levels of ABS.
FULL backup is performed on Sunday for /usr/users/smith/
(backup date "20-apr-1997 00:00")
Level 1 incremental is performed, and ABS figures out that the last
backup was performed at "20-apr-1997 00:00" and it issues a Gnutar
command to backup files created/modified after "20-apr-1997 00:00".
(backup date "21-apr-1997 00:00")
Level 2 incremental is performed, and ABS figures out that the last
backup was performed at "21-apr-1997 00:00" and it issues a Gnutar
command to backup files created/modified after "21-apr-1997 00:00".
(backup date "22-apr-1997 00:00")
ABS's incremental level can go up to level 6 on Saturday, then it goes
back to do FULL on Sunday for weekly full and daily incremental
scheduling.
Masami
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