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git-annex can be configured to require more than one copy of a file exists,
as a simple backup for your data. This is controlled by the "annex.numcopies"
setting, which defaults to 1 copy. Let's change that to require 2 copies,
and send a copy of every file to a USB drive.
# echo "* annex.numcopies=2" >> .gitattributes
# git annex copy . --to usbdrive
Now when we try to `git annex drop` a file, it will verify that it
knows of 2 other repositories that have a copy before removing its
content from the current repository.
You can also vary the number of copies needed, depending on the file name.
So, if you want 3 copies of all your flac files, but only 1 copy of oggs:
# echo "*.ogg annex.numcopies=1" >> .gitattributes
# echo "*.flac annex.numcopies=3" >> .gitattributes
Or, you might want to make a directory for important stuff, and configure
it so anything put in there is backed up more thoroughly:
# mkdir important_stuff
# echo "* annex.numcopies=3" > important_stuff/.gitattributes
For more details about the numcopies setting, see [[copies]].
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