Steps to reproduce:

1. Go to Tool/Backup
2. Under Manual Backup: insert path in which you don't have access.
3. Click Backup
   -> You see Backup finished on the page, but that's not true and you can see this stacktrace in the log:

   2013-03-07 13:40:52,523 ERROR info.magnolia.module.backup.BackupRun             : /test/backup-13-03-07_1339/repoConfig.zip (No such file or directory)
   java.io.FileNotFoundException: /test/backup-13-03-07_1339/repoConfig.zip (No such file or directory)
   	at java.io.FileOutputStream.open(Native Method)
   	at java.io.FileOutputStream.<init>(FileOutputStream.java:194)
   	at java.io.FileOutputStream.<init>(FileOutputStream.java:145)
   	at info.magnolia.module.backup.ZipHandler.init(ZipHandler.java:71)
   	at info.magnolia.module.backup.ZipHandler.<init>(ZipHandler.java:66)
   	at info.magnolia.module.backup.BackupRun.execute(BackupRun.java:118)
   	at info.magnolia.module.backup.pages.BackupPage.manualBackup(BackupPage.java:158)
   	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
   	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
   	at java.lang.reflect.Method.invoke(Method.java:597)
   	at info.magnolia.cms.servlets.MVCServletHandlerImpl.execute(MVCServletHandlerImpl.java:121)
   	at info.magnolia.cms.servlets.CommandBasedMVCServletHandler.execute(CommandBasedMVCServletHandler.java:84)
   	at info.magnolia.cms.servlets.MVCServlet.doPost(MVCServlet.java:125)
   	at info.magnolia.cms.servlets.MVCServlet.doGet(MVCServlet.java:70)
   	at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
   	at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
   	at info.magnolia.cms.filters.ServletDispatchingFilter.doFilter(ServletDispatchingFilter.java:123)
   	at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:91)
   	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
   	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:85)
   	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:85)
   	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:85)
   	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:85)
   	at info.magnolia.cms.filters.CompositeFilter.doFilter(CompositeFilter.java:67)
   	at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:91)
   	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
   	at info.magnolia.cms.filters.VirtualUriFilter.doFilter(VirtualUriFilter.java:70)
   	at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:91)
   	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
   	at info.magnolia.module.cache.executor.Bypass.processCacheRequest(Bypass.java:58)
   	at info.magnolia.module.cache.executor.CompositeExecutor.processCacheRequest(CompositeExecutor.java:66)
   	at info.magnolia.module.cache.filter.CacheFilter.doFilter(CacheFilter.java:153)
   	at info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:61)
   	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
   	at info.magnolia.cms.i18n.I18nContentSupportFilter.doFilter(I18nContentSupportFilter.java:76)
   	at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:91)
   	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
   	at info.magnolia.cms.filters.RangeSupportFilter.doFilter(RangeSupportFilter.java:84)
   	at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:91)
   	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
   	at info.magnolia.cms.security.BaseSecurityFilter.doFilter(BaseSecurityFilter.java:60)
   	at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:91)
   	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
   	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:85)
   	at info.magnolia.cms.security.SecurityCallbackFilter.doFilter(SecurityCallbackFilter.java:86)
   	at info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:61)
   	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
   	at info.magnolia.cms.security.LogoutFilter.doFilter(LogoutFilter.java:93)
   	at info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:61)
   	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
   	at info.magnolia.module.templatingkit.filters.SiteMergeFilter.doFilter(SiteMergeFilter.java:99)
   	at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:91)
   	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
   	at info.magnolia.module.extendedtemplatingkit.filters.MultiSiteFilter.doFilter(MultiSiteFilter.java:100)
   	at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:91)
   	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
   	at info.magnolia.cms.filters.MultiChannelFilter.doFilter(MultiChannelFilter.java:83)
   	at info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:61)
   	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
   	at info.magnolia.module.cache.filter.GZipFilter.doFilter(GZipFilter.java:75)
   	at info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:61)
   	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
   	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:85)
   	at info.magnolia.cms.security.auth.login.LoginFilter.doFilter(LoginFilter.java:93)
   	at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:91)
   	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
   	at info.magnolia.enterprise.registration.RegistrationFilter.doFilter(RegistrationFilter.java:52)
   	at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:91)
   	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
   	at info.magnolia.cms.filters.UnicodeNormalizationFilter.doFilter(UnicodeNormalizationFilter.java:90)
   	at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:91)
   	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
   	at info.magnolia.cms.filters.CosMultipartRequestFilter.doFilter(CosMultipartRequestFilter.java:91)
   	at info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:61)
   	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
   	at info.magnolia.module.devicedetection.filter.DeviceDetectionFilter.doFilter(DeviceDetectionFilter.java:73)
   	at info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:61)
   	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
   	at info.magnolia.cms.filters.ContentTypeFilter.doFilter(ContentTypeFilter.java:102)
   	at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:91)
   	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
   	at info.magnolia.cms.filters.ContextFilter.doFilter(ContextFilter.java:131)
   	at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:91)
   	at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
   	at info.magnolia.cms.filters.CompositeFilter.doFilter(CompositeFilter.java:67)
   	at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:91)
   	at info.magnolia.cms.filters.SafeDestroyMgnlFilterWrapper.doFilter(SafeDestroyMgnlFilterWrapper.java:108)
   	at info.magnolia.cms.filters.MgnlFilterDispatcher.doDispatch(MgnlFilterDispatcher.java:67)
   	at info.magnolia.cms.filters.MgnlMainFilter.doFilter(MgnlMainFilter.java:108)
   	at info.magnolia.cms.filters.MgnlMainFilter.doFilter(MgnlMainFilter.java:94)
   	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
   	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
   	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
   	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
   	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
   	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
   	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
   	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
   	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)
   	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
   	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
   	at java.lang.Thread.run(Thread.java:662)