do back/forward ports (53)

[ThomasWaldmann]

https://github.com/borgbackup/borg/issues?utf8=%E2%9C%93&q=label%3Abackport%2F1.1-maint
https://github.com/borgbackup/borg/issues?utf8=%E2%9C%93&q=label%3Aforwardport%2Fmaster

do 2 simple/small or 1 mid-sized/mid-complex forward/backport from there.

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💰 there is a bounty for this

I'll work on some more here.

After this I'll see about the typo backport. Your notes suggested these two should be backported first though which is why I've waited.