[BUG] Backup restore say "Error while restoring: invalid block type"

Start at org.nzbhydra.backup.BackupAndRestore and ExtractZipFileVisitor.java, then reproduce the restore using the reported backup and container setup. Trace the ZIP extraction failure and verify that a backup created by the official amd64-linux binary can be restored successfully in the Docker installation.

Is there an existing issue for this?

• I have searched the existing issues

Current Behavior

Expected Behavior

No response

Steps To Reproduce

1. Backup export made from official binary for amd64-linux version (theotherp/nzbhydra2), v9.0.2.
2. Check the zip with any archive manager.
3. Try to import it from a fresh install of linuxserver/nzbhydra2
4. Try again with new backups and restarts of service/systemd and container

Environment

- OS+FS of my install and backup source: CashyOS + btrfs
- OS+FS of my Docker install and restore target: Debian 13 + ext4
- How docker service was installed: standard APT method

CPU architecture

x86-64

Docker creation

nzbhydra:
    image: lscr.io/linuxserver/nzbhydra2
    container_name: nzbhydra
    restart: unless-stopped
    stop_grace_period: 120s
    depends_on: [gluetun]
    network_mode: "service:gluetun"
    security_opt:
      - no-new-privileges:true
    volumes:
      - /opt/containers/nzbhydra/AppData:/config
      - /data/downloads:/downloads
    environment:
      PUID: 1000
      PGID: 1000
    healthcheck:
      test: ["CMD-SHELL", "wget -qO- http://localhost:5076/ >/dev/null"]
      interval: 30s
      timeout: 10s
      retries: 3

Container logs

User UID:    1000
User GID:    1000
───────────────────────────────────────
Linuxserver.io version: v9.0.2-ls105
Build-date: 2026-09-20T12:36:25+00:00
───────────────────────────────────────
    
[custom-init] No custom files found, skipping...
Logging wrapper output to /config/logs/wrapper.log
INFO - Determined release type: native
INFO - Starting NZBHydra main process with command line: ./core -Xmx256M -DfromWrapper=true -DinternalApiKey=nndhpxzwftvkkyuneyka -Dsun.security.pkcs11.enable-solaris=false -Dfile.encoding=UTF8 -Dspring.output.ansi.enabled=ALWAYS --nobrowser --datafolder /config in folder /app/nzbhydra2
17:05:34.715 [main] INFO org.nzbhydra.NzbHydra -- Version: 9.0.2
17:05:34.715 [main] INFO org.nzbhydra.NzbHydra -- Build timestamp: 2026-09-20 06:38
.__   __.  ________  .______   __    __  ____    ____  _______  .______          ___          ___
|  \ |  | |       /  |   _  \ |  |  |  | \   \  /   / |       \ |   _  \        /   \        |__ \
|   \|  | `---/  /   |  |_)  ||  |__|  |  \   \/   /  |  .--.  ||  |_)  |      /  ^  \          ) |
|  . `  |    /  /    |   _  < |   __   |   \_    _/   |  |  |  ||      /      /  /_\  \        / /
|  |\   |   /  /----.|  |_)  ||  |  |  |     |  |     |  '--'  ||  |\  \----./  _____  \      / /_
|__| \__|  /________||______/ |__|  |__|     |__|     |_______/ | _| `._____/__/     \__\    |____|
 INFO --- [              main] org.nzbhydra.NzbHydra                    : Starting AOT-processed NzbHydra using Java 25.0.4.1 with PID 184 (/app/nzbhydra2/core started by abc in /app/nzbhydra2)
 INFO --- [              main] org.nzbhydra.NzbHydra                    : The following 1 profile is active: "default"
 INFO --- [              main] o.s.boot.tomcat.TomcatWebServer          : Tomcat initialized with port 5076 (http)
 INFO --- [              main] b.w.c.s.WebApplicationContextInitializer : Root WebApplicationContext: initialization completed in 71 ms
 INFO --- [              main] org.nzbhydra.config.BaseConfigHandler    : Using data folder /config
 INFO --- [              main] o.n.a.HydraAnonymousAuthenticationFilter : Granting basic user rights to anonymous users
 INFO --- [              main] o.n.a.HydraAnonymousAuthenticationFilter : Granting stats rights to anonymous users
 INFO --- [              main] o.n.a.HydraAnonymousAuthenticationFilter : Granting admin rights to anonymous users
 INFO --- [              main] com.zaxxer.hikari.HikariDataSource       : HikariPool-1 - Starting...
 INFO --- [              main] com.zaxxer.hikari.pool.HikariPool        : HikariPool-1 - Added connection conn0: url=jdbc:h2:file:/config/database/nzbhydra user=<r>
 INFO --- [              main] com.zaxxer.hikari.HikariDataSource       : HikariPool-1 - Start completed.
 WARN --- [              main] org.flywaydb.core.FlywayExecutor         : Unable to scan location: /18!/migration (unsupported protocol: resource)
 WARN --- [              main] org.flywaydb.core.FlywayExecutor         : Unable to scan location: /18!/migration (unsupported protocol: resource)
 INFO --- [              main] org.flywaydb.core.FlywayExecutor         : Database: jdbc:h2:file:/config/database/nzbhydra (H2 2.4)
 WARN --- [              main] o.f.c.i.s.classpath.ClassPathScanner     : Unable to scan location: /18!/migration (unsupported protocol: resource)
 WARN --- [              main] o.f.c.i.s.classpath.ClassPathScanner     : Unable to scan location: /18!/migration (unsupported protocol: resource)
 WARN --- [              main] o.f.c.internal.database.base.Database    : Using H2 2.4.240 which is newer than the version Flyway has been verified with. The latest verified version of H2 is 2.3.232.
 INFO --- [              main] o.f.core.internal.command.DbValidate     : Successfully validated 9 migrations (execution time 00:00.040s)
 INFO --- [              main] o.f.core.internal.command.DbMigrate      : Current version of schema "PUBLIC": 9
 INFO --- [              main] o.f.core.internal.command.DbMigrate      : Schema "PUBLIC" is up to date. No migration necessary.
 INFO --- [              main] j.LocalContainerEntityManagerFactoryBean : Initialized JPA EntityManagerFactory for persistence unit 'default'
 INFO --- [              main] org.nzbhydra.update.UpdateManager        : Running version 9.0.2
 WARN --- [              main] org.nzbhydra.NzbHydra                    : Overwritten settings will be displayed with their original value in the config section of the GUI
 INFO --- [              main] o.s.d.j.r.query.QueryEnhancerFactories   : Hibernate is in classpath; If applicable, HQL parser will be used.
 INFO --- [              main] o.n.d.downloaders.DownloaderProvider     : Loading downloaders
 INFO --- [              main] o.n.d.downloaders.DownloaderProvider     : Finished initializing active downloaders
 INFO --- [              main] o.n.d.downloaders.DownloaderProvider     : No downloaders configured
 INFO --- [              main] o.n.searching.SearchModuleProvider       : Loading indexers
 INFO --- [              main] o.n.searching.SearchModuleProvider       : Finished initializing active indexers
 WARN --- [              main] o.n.searching.SearchModuleProvider       : No indexers configured
 INFO --- [              main] r$InitializeUserDetailsManagerConfigurer : Global AuthenticationManager configured with UserDetailsService bean with name hydraUserDetailsManager
 INFO --- [              main] o.n.auth.HeaderAuthenticationFilter      : Using internal API key
 WARN --- [              main] o.s.w.s.resource.ResourceHandlerUtils    : Appended trailing slash to static resource location: file:/config/additionalStatic/
 WARN --- [              main] i.m.c.i.binder.jvm.JvmGcMetrics          : GC notifications will not be available because no GarbageCollectorMXBean of the JVM provides any. GCs=[young generation scavenger, complete scavenger]
 INFO --- [              main] o.s.b.a.e.web.EndpointLinksResolver      : Exposing 14 endpoints beneath base path '/actuator'
 INFO --- [              main] org.nzbhydra.tasks.HydraTaskScheduler    : Scheduling task "Problem detector" to be run every 1 hour
 INFO --- [              main] org.nzbhydra.tasks.HydraTaskScheduler    : Scheduling task "Check for and install updates" to be run every 1 hour
 INFO --- [              main] org.nzbhydra.tasks.HydraTaskScheduler    : Scheduling task "Delete temporary ZIP files" to be run every 1 hour
 INFO --- [              main] org.nzbhydra.tasks.HydraTaskScheduler    : Scheduling task "Delete short term storage results" to be run every 12 hours
 INFO --- [              main] org.nzbhydra.tasks.HydraTaskScheduler    : Scheduling task "Delete old history entries" to be run every 1 hour
 INFO --- [              main] org.nzbhydra.tasks.HydraTaskScheduler    : Scheduling task "Scheduled restart" to be run every 1 minute
 INFO --- [              main] org.nzbhydra.tasks.HydraTaskScheduler    : Scheduling task "Download queue check" to be run every 10 seconds
 INFO --- [              main] org.nzbhydra.tasks.HydraTaskScheduler    : Scheduling task "Backup" to be run every 1 hour
 INFO --- [              main] org.nzbhydra.tasks.HydraTaskScheduler    : Scheduling task "Clean up indexer statuses" to be run every 1 minute
 INFO --- [              main] org.nzbhydra.tasks.HydraTaskScheduler    : Scheduling task "Download history check" to be run every 10 minutes
 INFO --- [              main] org.nzbhydra.tasks.HydraTaskScheduler    : Scheduling task "Delete old search results" to be run every 1 hour
 INFO --- [              main] o.s.m.s.b.SimpleBrokerMessageHandler     : Starting...
 INFO --- [              main] o.s.m.s.b.SimpleBrokerMessageHandler     : BrokerAvailabilityEvent[available=true, SimpleBrokerMessageHandler [org.springframework.messaging.simp.broker.DefaultSubscriptionRegistry@5bdc9950]]
 INFO --- [              main] o.s.m.s.b.SimpleBrokerMessageHandler     : Started.
 INFO --- [              main] o.s.boot.tomcat.TomcatWebServer          : Tomcat started on port 5076 (http) with context path '/'
 INFO --- [              main] org.nzbhydra.NzbHydra                    : Started NzbHydra in 1.31 seconds (process running for 1.385)
 INFO --- [              main] org.nzbhydra.NzbHydra                    : You seem to be running NZBHydra 2 in docker. You can access Hydra using your local address and the IP you provided
 INFO --- [              main] o.nzbhydra.database.DatabaseStatistics   : H2 database statistics: info.BUILD_ID = 240, info.CACHE_HIT_RATIO = 96, info.CACHE_MAX_SIZE = 16, info.CACHE_SIZE = 0, info.CHUNKS_FILL_RATE = 80, info.CHUNKS_FILL_RATE_RW = 87, info.CHUNK_COUNT = 3, info.CURRENT_VERSION = 7, info.FILE_READ = 45, info.FILE_READ_BYTES = 58944, info.FILE_SIZE = 94208, info.FILE_WRITE = 1, info.FILE_WRITE_BYTES = 8192, info.FILL_RATE = 58, info.LEAF_RATIO = 80, info.OLDEST_VERS_TO_KEEP = 7, info.PAGE_COUNT = 33, info.PAGE_COUNT_LIVE = 23, info.PAGE_SIZE = 16384, info.TOC_CACHE_HIT_RATIO = 0, info.UPDATE_FAILURE_PERCENT = 0.00%, info.VERSION = 2.4.240 (2025-09-22), info.VERSIONS_TO_KEEP = 0, info.VERSION_MAJOR = 2, info.VERSION_MINOR = 4
Connection to localhost (127.0.0.1) 5076 port [tcp/*] succeeded!
[ls.io-init] done.
 INFO --- [http-nio-0.0.0.0-5] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring DispatcherServlet 'dispatcherServlet'
 INFO --- [http-nio-0.0.0.0-5] o.s.web.servlet.DispatcherServlet        : Initializing Servlet 'dispatcherServlet'
 INFO --- [http-nio-0.0.0.0-5] o.s.web.servlet.DispatcherServlet        : Completed initialization in 1 ms
     INFO --- [http-nio-0.0.0.0-5] org.nzbhydra.backup.BackupAndRestore     : [Host: 192.168.1.110] Extracting from file /tmp/nzbhydra-restore11347946211993312084.zip to folder /config/restore
    ERROR --- [http-nio-0.0.0.0-5] org.nzbhydra.backup.BackupAndRestore     : [Host: 192.168.1.110] Error while restoring
    java.util.zip.ZipException: invalid block type
    	at [email protected]/java.util.zip.InflaterInputStream.read(InflaterInputStream.java:214)
    	at [email protected]/java.io.InputStream.transferTo(InputStream.java:795)
    	at [email protected]/java.nio.file.Files.copy(Files.java:2864)
    	at [email protected]/java.nio.file.CopyMoveHelper.copyToForeignTarget(CopyMoveHelper.java:147)
    	at [email protected]/java.nio.file.Files.copy(Files.java:1195)
    	at org.nzbhydra.backup.ExtractZipFileVisitor.visitFile(ExtractZipFileVisitor.java:32)
    	at org.nzbhydra.backup.ExtractZipFileVisitor.visitFile(ExtractZipFileVisitor.java:14)
    	at [email protected]/java.nio.file.Files.walkFileTree(Files.java:2543)
    	at [email protected]/java.nio.file.Files.walkFileTree(Files.java:2609)
    	at org.nzbhydra.backup.BackupAndRestore.extractZip(BackupAndRestore.java:334)
    	at org.nzbhydra.backup.BackupAndRestore.restoreFromFile(BackupAndRestore.java:321)
    	at org.nzbhydra.backup.BackupAndRestore.restoreFromFile(BackupAndRestore.java:298)
    	at org.graalvm.nativeimage.builder/com.oracle.svm.core.reflect.SubstrateMethodAccessor.invoke(SubstrateMethodAccessor.java:118)
    	at org.nzbhydra.backup.BackupAndRestore$$SpringCGLIB$$0.restoreFromFile(<generated>) [3 skipped]
    	at org.nzbhydra.backup.BackupWeb.restoreFromUpload(BackupWeb.java:80)
     INFO --- [http-nio-0.0.0.0-5] org.nzbhydra.backup.BackupAndRestore     : [Host: 192.168.1.110] Extracting from file /tmp/nzbhydra-restore11945049185920457717.zip to folder /config/restore
    ERROR --- [http-nio-0.0.0.0-5] org.nzbhydra.backup.BackupAndRestore     : [Host: 192.168.1.110] Error while restoring
    java.util.zip.ZipException: invalid block type
    	at [email protected]/java.util.zip.InflaterInputStream.read(InflaterInputStream.java:214)
    	at [email protected]/java.io.InputStream.transferTo(InputStream.java:795)
    	at [email protected]/java.nio.file.Files.copy(Files.java:2864)
    	at [email protected]/java.nio.file.CopyMoveHelper.copyToForeignTarget(CopyMoveHelper.java:147)
    	at [email protected]/java.nio.file.Files.copy(Files.java:1195)
    	at org.nzbhydra.backup.ExtractZipFileVisitor.visitFile(ExtractZipFileVisitor.java:32)
    	at org.nzbhydra.backup.ExtractZipFileVisitor.visitFile(ExtractZipFileVisitor.java:14)
    	at [email protected]/java.nio.file.Files.walkFileTree(Files.java:2543)
    	at [email protected]/java.nio.file.Files.walkFileTree(Files.java:2609)
    	at org.nzbhydra.backup.BackupAndRestore.extractZip(BackupAndRestore.java:334)
    	at org.nzbhydra.backup.BackupAndRestore.restoreFromFile(BackupAndRestore.java:321)
    	at org.nzbhydra.backup.BackupAndRestore.restoreFromFile(BackupAndRestore.java:298)
    	at org.graalvm.nativeimage.builder/com.oracle.svm.core.reflect.SubstrateMethodAccessor.invoke(SubstrateMethodAccessor.java:118)
    	at org.nzbhydra.backup.BackupAndRestore$$SpringCGLIB$$0.restoreFromFile(<generated>) [3 skipped]
    	at org.nzbhydra.backup.BackupWeb.restoreFromUpload(BackupWeb.java:80)
     INFO --- [http-nio-0.0.0.0-5] o.n.d.downloaders.sabnzbd.Sabnzbd        : [Host: 192.168.1.110] Connection check with sabNZBd using URL http://127.0.0.1:5086/api?apikey=<apikey>&output=json&mode=queue successful
     INFO --- [http-nio-0.0.0.0-5] org.nzbhydra.config.ConfigWeb            : [Host: 192.168.1.110] Received new config
     WARN --- [http-nio-0.0.0.0-5] o.n.c.validation.BaseConfigValidator     : [Host: 192.168.1.110] Config validation returned warnings:
    No indexers configured. You won't get any results
     INFO --- [http-nio-0.0.0.0-5] o.n.a.HydraAnonymousAuthenticationFilter : [Host: 192.168.1.110] Granting basic user rights to anonymous users
     INFO --- [http-nio-0.0.0.0-5] o.n.a.HydraAnonymousAuthenticationFilter : [Host: 192.168.1.110] Granting stats rights to anonymous users
     INFO --- [http-nio-0.0.0.0-5] o.n.a.HydraAnonymousAuthenticationFilter : [Host: 192.168.1.110] Granting admin rights to anonymous users
     INFO --- [http-nio-0.0.0.0-5] o.n.d.downloaders.DownloaderProvider     : [Host: 192.168.1.110] Loading downloaders
     INFO --- [http-nio-0.0.0.0-5] o.n.d.downloaders.DownloaderProvider     : [Host: 192.168.1.110] Initializing downloader SABnzbd
     INFO --- [http-nio-0.0.0.0-5] o.n.d.downloaders.DownloaderProvider     : [Host: 192.168.1.110] Finished initializing active downloaders
     INFO --- [http-nio-0.0.0.0-5] o.n.searching.SearchModuleProvider       : [Host: 192.168.1.110] Loading indexers
     INFO --- [http-nio-0.0.0.0-5] o.n.searching.SearchModuleProvider       : [Host: 192.168.1.110] Finished initializing active indexers
     WARN --- [http-nio-0.0.0.0-5] o.n.searching.SearchModuleProvider       : [Host: 192.168.1.110] No indexers configured