Recently I was suggested I read
https://www.gnu.org/software/xorriso/
and
http://scdbackup.sourceforge.net/main_eng.html
which led to exploring "afio archives" and "zisofs compression".
Have you considered rsync. I wound make sure that a backup system would handle
all the file attributes a modern linux system uses. I have a few files I made
immutable so programs cant change them on me. Your 10TB drive could even be
located on a separate system. rsync compresses files as they are transferred so
network bandwidth shouldn't be a problem ... assuming at least a 1gb
connection. rsync doesn't compress the files on the destination though.
The simple command:
rsync -aHAXxv / bkup:machine1/root
Would copy the root filesystem on the current machine to the bkup machine in the
directory machine1/root. The word bkup could be a DNS or host file entry or
just an ip address.
The directory machine1 could be a mounted partition or just a directory on a
large ~10TB filesystem .... an advantage that you wouldn't need to worry about
the size of the disk you are copying. The lower case x option causes rsync to
only copy one file system ( root / ) if you wanted to copy the home directory
separately if it was mounted on a separate partition on the source system.
Another advantage to this system is you can see/access every file just where you
expect it to be ... no mounting of a iso file system or using another program to
access the extended iso. Also, I'm not sure I would rely on flash drives as a
long term backup. The bits are stored as a small electric charge that could
dissipate over time.
*...Bob*