src/vs/workbench/services/workingCopy/common/untitledFileWorkingCopy.ts/UntitledFileWorkingCopy/backup
class UntitledFileWorkingCopy:	async backup(token: CancellationToken): Promise<IWorkingCopyBackup> {

		// Fill in content if we are resolved
		let content: VSBufferReadableStream | undefined = undefined;
		if (this.isResolved()) {
			content = await raceCancellation(this.model.snapshot(token), token);
		}

		return { content };
	}