Update dependencies.
Add an ArchiveData wrapper type.
Expose the Open method.
Fix up some doc comments.
Drop a superfluous assignment.
NewArchiveFile -> NewArchiveData (and add data parameter).
af -> ad.
Pull ArchiveData out of the archive package.
Add a test for legacy version.
Adjust to upstream changes.
Add an Upload method to the backups API client.
Add tests.
Be explicit about the temp dir.
Stop using a temp file to upload the backup archive.
Add a test for CopyReader.
Get the API server address from API state.
Leave a note regarding SSH keys.
Upload the file to the SSH user's home directory.
Move SSH upload implementation into state/backups.
Keep low-level upload implementation details out of state/backups.