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I've been using git-annex for a little while now to keep two copies of my data backed up across three and soon to be four external hard drives. I recently came across the preferred content expressions and realized that they could make my life a lot easier, but I want to make sure I understand them correctly first.
As I mentioned, I want two copies of my data stored across several external hard drives. Right now I keep track of this manually and I don't try to balance the data between drives. From what I understand, I can add the repository from each drive to the archive group. And then call
```
git annex groupwanted archive (not (copies=archive:2 and balanced=archive:lackingcopies))
git annex wanted here groupwanted
```
And then when I sync the repositories it will try and balance the data between themselves while ensuring there are at least two copies of the data. I can also easily add hard drives to the system by cloning a repository on them and then adding it to the group.
Do I have the correct understanding here or am I missing something? Are there any suggestions or advice you have for this setup? Is using `fullybalanced` or `sizebalanced` better?