'duplicacy backup' needs -pref-dir option

implemented
backup

#1

Otherwise it’s impossible to backup read-only directories (e.g. /Library/Application Support on OSX).

Duplicacy should not require a config file in the source directory to begin with, but that’s a different story…


#2

There is a PR that implemented this feature: https://github.com/gilbertchen/duplicacy/pull/396

I’ll merge this PR tomorrow. You can try to build from this PR if you want.


#3

Awesome, thank you!


#4

Could someone clarify how this feature request here relates to this one: