cp: cannot stat ‘/data/yocto-autobuilder/persistdb/nightly-x86/master/poky/bb_persist_data.sqlite3’: No such file or directory It's right you know, that directory doesn't exist yet.
Marking this in progress review: http://git.yoctoproject.org/cgit/cgit.cgi/yocto-autobuilder/commit/?h=eflanagan/yocto-autobuilder-dev&id=dc5cd0eeba93a736f5d043c61915036d97fadba2
Pushed to master