Add a bit more Javadoc to the backup infrastructure and clean up unused imports. Change-Id: I8ab7c3fb887ae2e8d2f1bfac42f03cb4b42685ef
Add a bit more Javadoc to the backup infrastructure and clean up unused imports. Change-Id: I8ab7c3fb887ae2e8d2f1bfac42f03cb4b42685ef