I have a question:
Now there is is default.conf

BORGBACKUP_COMPRESSION="none"

I assume this enforces "none" compression for rear
regardless what the users may have set in its Borg
configuration (I assume the user can configure
a compression that Borg should use), cf
#1037 (comment)
where I assumed that with an empty
BORG_COMPRESSION=""
the Borg default gets used.

Bottom line: I wonder if

BORGBACKUP_COMPRESSION=""

would be more in compliance with Borg?

@jsmeix , exactly none compression is enforced now. I guess this is not right thing to do :-(.
BORGBACKUP_COMPRESSION="" will not however work as value is appended like this
borg create --compression <BORGBACKUP_COMPRESSION> .. so it would throw syntax error.

I'll think about some way how to solve this.

Thanks for checking!

ehm, not sure if it is clear from above text, but user can change compression setting e.g. BORGBACKUP_COMPRESSION="zlib,9" in local.conf

Of course the user can specify what he wants in local.conf
but my point and Thomas Waldmann's point in
#1037 (comment)
is that when the user does not specify anything,
then rear should use Borg in its default mode.

In other words:
When the user does not specify anything in rear,
rear should not specify something special for Borg.

Ok, I'll correct it.