## What you probably want

* Over a network
  * If the files are easily compressed and both machines are fast: `rsync -avz`
  * Otherwise: `rsync -av`
* Mirroring a hard disk with issues
  * `rsync -avc`

### FAT filesystems

If you're copying to a FAT filesystem, use `rsync -rtlD --modify-window=2`. FAT filesystem time resolution isn't as exact as, say, ext4, so `modify-window` gives some wiggle room to time comparisons.

From https://superuser.com/a/1785111

### Moving files

You probably want `--remove-source-files`. Verify that copies work first! Chaining an equivalent `rsync` with `--remove-source-files` added after the first `rsync` can help you verify before committing to the deletion.

## Guides

* https://devhints.io/rsync -- Shows the 90% of commands you're likely to use