Dear Team,
I am sending you a copy of my message I sent to Paul Eggert. He
recommended me to do so.
I hope that I will not disturb you with my message. I have been using
Linux at home for more than two decades and making backups with tar on a
tape. Recently I have tried to optimise the process. My test was as follows:
1. create a backup with "-c" and "--listed-incremental" on a tape
2. modify one of the files on disk
3. create another backup with "-r" and "--listed-incremental" to append the
data to the previous tar on the tape
What I noticed was that all files were stored again. I expected only one
modified file to be stored.
Would it be possible to adjust tar so that it can apply "--listed-
incremental" with "-r" the way it does it with "-c"? When I use "-r" the
tars
are nicely appended one after another on tape without gaps. When I use
"-c" to append tars to a tape, there are always zero blocks in between and
it is much more difficult to position the tape for reading later with
commands like mt.
Best regards,
Paweł
