[gentoo-user] Backup program that compresses data but only changes new files.

[Dale]

Howdy,

With my new fiber internet, my poor disks are getting a work out, and
also filling up.  First casualty, my backup disk.  I have one directory
that is . . . well . . . huge.  It's about 7TBs or so.  This is where it
is right now and it's still trying to pack in files. 


/dev/mapper/8tb            7.3T  7.1T  201G  98% /mnt/8tb


Right now, I'm using rsync which doesn't compress files but does just
update things that have changed.  I'd like to find some way, software
but maybe there is already a tool I'm unaware of, to compress data and
work a lot like rsync otherwise.  I looked in app-backup and there is a
lot of options but not sure which fits best for what I want to do. 
Again, backup a directory, compress and only update with changed or new
files.  Generally, it only adds files but sometimes a file gets replaced
as well.  Same name but different size. 

I was trying to go through the list in app-backup one by one but to be
honest, most links included only go to github or something and usually
doesn't tell anything about how it works or anything.  Basically, as far
as seeing if it does what I want, it's useless. It sort of reminds me of
quite a few USE flag descriptions. 

I plan to buy another hard drive pretty soon.  Next month is possible. 
If there is nothing available that does what I want, is there a way to
use rsync and have it set to backup files starting with "a" through "k"
to one spot and then backup "l" through "z" to another?  I could then
split the files into two parts.  I use a script to do this now, if one
could call my little things scripts, so even a complicated command could
work, just may need help figuring out the command.

Thoughts?  Ideas? 

Dale

:-)  :-)