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Number   :  3248
Date     :  2002-12-12
Author   :  Kan Yabumoto
Subject  :  Re: Preserving Generation Backups
Size(KB) :  2


Martin:

If you want to make exception to the LastAccess scheme,
use the /X (exclude) feature. Or, create a list of
such files and directories and use /EX.



>What I was hoping for is a scheme that triggers the delete function based 
>solely on the timestamp of the backup_dir "folder", and not on any 
>particular file "in the folder". If the timestamp "of the folder" is 
>within the /db# parameter, xxcopy moves on and leave the folder in its 
>entirety. On the other hand, if the folder is outside the parameter 
>identified by the /db# switch, xxcopy then removes the folder using the 
>/rmdir switch (thereby also wiping out all contents within that 
>folder). An all-or-none function, so to speak.

So far, the directory timestamp is used in conjunction with the
/DA/DB/DO operation in a carefully chosen set of operations that
do not interfere with the filetime comparison operation (the
most important case).

That is, the timestamp comparison is use in /LTREE operation
(which is similar to /L except that it displays only the
directory names).

In the case of an /LTREE operation, there will be no file-related
operation. So, in this limited context, we chose to allow
timestamp comparison (/DA/DB/DO) to take effect on the directory.
But, this is purely an exception.

If we were to allow similar timestamp-related directory selection,
we will have to add a new set of switches to do just that.

One reason why XXCOPY hardly has any directory timestamp-related
feature was the fact we were quite ignorant about how the
NT/2K/XP versions allow application programs to manipulate the
directory timestamps. If you look back what I have been saying
about the directory timestamp, you will find that I had wrong
idea about what a program can do with directory timestamps
(In Win9X/ME environments, directory timestamps cannot be
easily manipulated, and therefore, we could not utilize the
full potential of directory timestamps.)

But now, XXCOPY just started to have the capability to
set and preserve the directory timestamps. So, we will take
a look at what we can do with the directory-timestamp features.

Probably what we need is a whole new set of switches that parallels
to how the /DA/DB/DO switches work with the file timestamps.

Kan Yabumoto



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