Install and Configure ThinBackup Plugin

From Plugin Manager, select Available tab, search for thinBackup plugin, select check box, then click to Install without restart

From Manage Jenkins, click to ThinBackup, then click to Settings

Normally we not need to backup build result, so uncheck Backup build results. Specify 0 0 0 mean do full backup every 7 days (This is for demo, you can specify timeline that suite with your jenkins system). Finally, click to Save button