[luau] thumb drive, incremental backup

[Hawaii Linux Institute]

one of the most useful features of a thumb drive (or a USB hard disk) is 
to do incremental backups.  I used to rely on a DOS program called 
xtree/ztree to do incremental backups in Windows, but in Linux, the task 
is substantially easier.

I am tossing in my way of doing incremental backups, if you have other 
approaches and/or comments, please share them with us:

First step, find all the files that have been modified in the past, say, 
7 days (for weekly backup), and save all their file names into a file 
called, say, backup.weekly:

find / -mtime -7 -print backup.weekly

Then, compress all those files into a tarball and store in into your 
thumb drive (which, I assume, has been mounted as /mnt):

tar -cvz -T backup.weekly -f /mnt

Comment: if you are using the thumb drive merely to do backups, of 
course, you don't need the bind option as I mentioned earlier.  Also, if 
you don't want to incrementally back up the entire disk, you can replace 
the slash ("/") with whatever directory you're interested.  For win4lin 
users, you can do a daily backup of your windows data by replacing "/" 
with "mydata", and the number "7" with "1", as follows:

find /home/xxxxx/mydata -mtime -1 -print backup.daily

Wayne