I’m facing issues with backing up my Discourse instance, the instance is setup to upload to Backblaze’s B2. Error log: Making sure archive does not already exist... Creating empty archive... Archiving data dump... Archiving uploads... Skipping uploads stored on S3. Removing tmp '/var/www/discourse/tmp/backups/default/2026-01-16-151337' directory... Gzipping archive, this may take a while... Uploading archive... EXCEPTION: failed to abort multipart upload: SSL_read: unexpected eof while reading. Multipart upload failed: Checksum Type mismatch occurred, expected checksum type: CRC32, actual checksum type: null; Checksum Type mismatch occurred, expected checksum type: CRC32, actual checksum type: null; Checksum Type mismatch occurred, expected checksum type: CRC32, actual checksum type: null; Checksum Type mismatch occurred, expected checksum type: CRC32, actual checksum type: null; Checksum Type mismatch occurred, expected checksum type: CRC32, actual checksum type: null; Checksum Type mismatch occurred, expected checksum type: CRC32, actual checksum type: null; Checksum Type mismatch occurred, expected checksum type: CRC32, actual checksum type: null; Checksum Type mismatch occurred, expected checksum type: CRC32, actual checksum type: null; Checksum Type mismatch occurred, expected checksum type: CRC32, actual checksum type: null; Checksum Type mismatch occurred, expected checksum type: CRC32, actual checksum type: null /var/www/discourse/vendor/bundle/ruby/3.3.0/gems/aws-sdk-s3-1.182.0/lib/aws-sdk-s3/multipart_file_uploader.rb:103:in `rescue in abort_upload' /var/www/discourse/vendor/bundle/ruby/3.3.0/gems/aws-sdk-s3-1.182.0/lib/aws-sdk-s3/multipart_file_uploader.rb:90:in `abort_upload' /var/www/discourse/vendor/bundle/ruby/3.3.0/gems/aws-sdk-s3-1.182.0/lib/aws-sdk-s3/multipart_file_uploader.rb:86:in `upload_parts' /var/www/discourse/vendor/bundle/ruby/3.3.0/gems/aws-sdk-s3-1.182.0/lib/aws-sdk-s3/multipart_file_uploader.rb:59:in `upload' /var/www/discourse/vendor/bundle/ruby/3.3.0/gems/aws-sdk-s3-1.182.0/lib/aws-sdk-s3/file_uploader.rb:42:in `block in upload' /var/www/discourse/vendor/bundle/ruby/3.3.0/gems/aws-sdk-core-3.227.0/lib/aws-sdk-core/plugins/user_agent.rb:90:in `metric' /var/www/discourse/vendor/bundle/ruby/3.3.0/gems/aws-sdk-s3-1.182.0/lib/aws-sdk-s3/file_uploader.rb:40:in `upload' /var/www/discourse/vendor/bundle/ruby/3.3.0/gems/aws-sdk-s3-1.182.0/lib/aws-sdk-s3/customizations/object.rb:477:in `block in upload_file' /var/www/discourse/vendor/bundle/ruby/3.3.0/gems/aws-sdk-core-3.227.0/lib/aws-sdk-core/plugins/user_agent.rb:90:in `metric' /var/www/discourse/vendor/bundle/ruby/3.3.0/gems/aws-sdk-s3-1.182.0/lib/aws-sdk-s3/customizations/object.rb:476:in `upload_file' /var/www/discourse/lib/backup_restore/s3_backup_store.rb:48:in `upload_file' /var/www/discourse/lib/backup_restore/backuper.rb:351:in `upload_archive' /var/www/discourse/lib/backup_restore/backuper.rb:41:in `run' script/discourse:115:in `backup' /var/www/discourse/vendor/bundle/ruby/3.3.0/gems/thor-1.4.0/lib/thor/command.rb:28:in `run' /var/www/discourse/vendor/bundle/ruby/3.3.0/gems/thor-1.4.0/lib/thor/invocation.rb:127:in `invoke_command' /var/www/discourse/vendor/bundle/ruby/3.3.0/gems/thor-1.4.0/lib/thor.rb:538:in `dispatch' /var/www/discourse/vendor/bundle/ruby/3.3.0/gems/thor-1.4.0/lib/thor/base.rb:584:in `start' script/discourse:397:in ` ' /usr/local/lib/ruby/gems/3.3.0/gems/bundler-2.6.4/lib/bundler/cli/exec.rb:59:in `load' /usr/local/lib/ruby/gems/3.3.0/gems/bundler-2.6.4/lib/bundler/cli/exec.rb:59:in `kernel_load' /usr/local/lib/ruby/gems/3.3.0/gems/bundler-2.6.4/lib/bundler/cli/exec.rb:23:in `run' /usr/local/lib/ruby/gems/3.3.0/gems/bundler-2.6.4/lib/bundler/cli.rb:452:in `exec' /usr/local/lib/ruby/gems/3.3.0/gems/bundler-2.6.4/lib/bundler/vendor/thor/lib/thor/command.rb:28:in `run' /usr/local/lib/ruby/gems/3.3.0/gems/bundler-2.6.4/lib/bundler/vendor/thor/lib/thor/invocation.rb:127:in `invoke_command' /usr/local/lib/ruby/gems/3.3.0/gems/bundler-2.6.4/lib/bundler/vendor/thor/lib/thor.rb:538:in `dispatch' /usr/local/lib/ruby/gems/3.3.0/gems/bundler-2.6.4/lib/bundler/cli.rb:35:in `dispatch' /usr/local/lib/ruby/gems/3.3.0/gems/bundler-2.6.4/lib/bundler/vendor/thor/lib/thor/base.rb:584:in `start' /usr/local/lib/ruby/gems/3.3.0/gems/bundler-2.6.4/lib/bundler/cli.rb:29:in `start' /usr/local/lib/ruby/gems/3.3.0/gems/bundler-2.6.4/exe/bundle:28:in `block in ' /usr/local/lib/ruby/gems/3.3.0/gems/bundler-2.6.4/lib/bundler/friendly_errors.rb:117:in `with_friendly_errors' /usr/local/lib/ruby/gems/3.3.0/gems/bundler-2.6.4/exe/bundle:20:in ` ' /usr/local/bin/bundle:25:in `load' /usr/local/bin/bundle:25:in ` ' Deleting old backups... Cleaning stuff up... Removing archive from local storage... Removing '.tar' leftovers... Marking backup as finished... Notifying 'system' of the end of the backup... Finished! [FAILED]

Yeah, my setup doesn’t have the AWS_*_CHECKSUM_CALCULATION configs, which is where your setup seems to be erroring. There’s a thread on that feature not being supported by B2, seems they recently implemented it, but I’m not sure if it actually works.

Yes, it worked until ~mid-December.

I’ll try to find the old files, I was doing some cleanup and deleted before checking :man_facepalming:t2:. I know this one `v20251209012613` was already failing. Will try to recover the older files to see when it stopped working.

I just got backblaze working on a fresh install, and by the looks of it you’re on older version of discourse - the version of ruby in your stacktrace is 3.3.0 and on mine it’s 3.4.0. Not sure if it’d make a difference, as the versions of aws-sdk-core and aws-sdk-s3 gems seem to be the same, but I thought it may be worth pointing out.

I just retried and got the same error. Setup: AWS_REQUEST_CHECKSUM_CALCULATION: WHEN_REQUIRED AWS_RESPONSE_CHECKSUM_VALIDATION: WHEN_REQUIRED DISCOURSE_USE_S3: true DISCOURSE_S3_REGION: "us-west-004" DISCOURSE_S3_INSTALL_CORS_RULE: false DISCOURSE_S3_CONFIGURE_TOMBSTONE_POLICY: false DISCOURSE_S3_ENDPOINT: 'https://s3.us-west-004.backblazeb2.com' DISCOURSE_S3_ACCESS_KEY_ID: '******' DISCOURSE_S3_SECRET_ACCESS_KEY: '******' DISCOURSE_S3_CDN_URL: 'https://******3.c******a.com' DISCOURSE_S3_BUCKET: c******a DISCOURSE_S3_BACKUP_BUCKET: 'c******a/backup' DISCOURSE_S3_UPLOAD_BUCKET: 'c******a' DISCOURSE_BACKUP_LOCATION: s3 Stacktrace: Gzipping archive, this may take a while... Uploading archive... EXCEPTION: failed to abort multipart upload: SSL_read: unexpected eof while reading. Multipart upload failed: Checksum Type mismatch occurred, expected checksum type: CRC32, actual checksum type: null; Checksum Type mismatch occurred, expected checksum type: CRC32, actual checksum type: null; Checksum Type mismatch occurred, expected checksum type: CRC32, actual checksum type: null; Checksum Type mismatch occurred, expected checksum type: CRC32, actual checksum type: null; Checksum Type mismatch occurred, expected checksum type: CRC32, actual checksum type: null; Checksum Type mismatch occurred, expected checksum type: CRC32, actual checksum type: null; Checksum Type mismatch occurred, expected checksum type: CRC32, actual checksum type: null; Checksum Type mismatch occurred, expected checksum type: CRC32, actual checksum type: null; Checksum Type mismatch occurred, expected checksum type: CRC32, actual checksum type: null; Checksum Type mismatch occurred, expected checksum type: CRC32, actual checksum type: null /var/www/discourse/vendor/bundle/ruby/3.4.0/gems/aws-sdk-s3-1.182.0/lib/aws-sdk-s3/multipart_file_uploader.rb:103:in 'Aws::S3::MultipartFileUploader#abort_upload' /var/www/discourse/vendor/bundle/ruby/3.4.0/gems/aws-sdk-s3-1.182.0/lib/aws-sdk-s3/multipart_file_uploader.rb:86:in 'Aws::S3::MultipartFileUploader#upload_parts' /var/www/discourse/vendor/bundle/ruby/3.4.0/gems/aws-sdk-s3-1.182.0/lib/aws-sdk-s3/multipart_file_uploader.rb:59:in 'Aws::S3::MultipartFileUploader#upload' /var/www/discourse/vendor/bundle/ruby/3.4.0/gems/aws-sdk-s3-1.182.0/lib/aws-sdk-s3/file_uploader.rb:42:in 'block in Aws::S3::FileUploader#upload' /var/www/discourse/vendor/bundle/ruby/3.4.0/gems/aws-sdk-core-3.227.0/lib/aws-sdk-core/plugins/user_agent.rb:90:in 'Aws::Plugins::UserAgent.metric' /var/www/discourse/vendor/bundle/ruby/3.4.0/gems/aws-sdk-s3-1.182.0/lib/aws-sdk-s3/file_uploader.rb:40:in 'Aws::S3::FileUploader#upload' /var/www/discourse/vendor/bundle/ruby/3.4.0/gems/aws-sdk-s3-1.182.0/lib/aws-sdk-s3/customizations/object.rb:477:in 'block in Aws::S3::Object#upload_file' /var/www/discourse/vendor/bundle/ruby/3.4.0/gems/aws-sdk-core-3.227.0/lib/aws-sdk-core/plugins/user_agent.rb:90:in 'Aws::Plugins::UserAgent.metric' /var/www/discourse/vendor/bundle/ruby/3.4.0/gems/aws-sdk-s3-1.182.0/lib/aws-sdk-s3/customizations/object.rb:476:in 'Aws::S3::Object#upload_file' /var/www/discourse/lib/backup_restore/s3_backup_store.rb:48:in 'BackupRestore::S3BackupStore#upload_file' /var/www/discourse/lib/backup_restore/creator.rb:434:in 'BackupRestore::Creator#upload_archive' /var/www/discourse/lib/backup_restore/creator.rb:41:in 'BackupRestore::Creator#run' script/discourse:115:in 'DiscourseCLI#backup' /var/www/discourse/vendor/bundle/ruby/3.4.0/gems/thor-1.4.0/lib/thor/command.rb:28:in 'Thor::Command#run' /var/www/discourse/vendor/bundle/ruby/3.4.0/gems/thor-1.4.0/lib/thor/invocation.rb:127:in 'Thor::Invocation#invoke_command' /var/www/discourse/vendor/bundle/ruby/3.4.0/gems/thor-1.4.0/lib/thor.rb:538:in 'Thor.dispatch' /var/www/discourse/vendor/bundle/ruby/3.4.0/gems/thor-1.4.0/lib/thor/base.rb:584:in 'Thor::Base::ClassMethods#start' script/discourse:397:in ' ' /usr/local/lib/ruby/gems/3.4.0/gems/bundler-2.6.4/lib/bundler/cli/exec.rb:59:in 'Kernel.load' /usr/local/lib/ruby/gems/3.4.0/gems/bundler-2.6.4/lib/bundler/cli/exec.rb:59:in 'Bundler::CLI::Exec#kernel_load' /usr/local/lib/ruby/gems/3.4.0/gems/bundler-2.6.4/lib/bundler/cli/exec.rb:23:in 'Bundler::CLI::Exec#run' /usr/local/lib/ruby/gems/3.4.0/gems/bundler-2.6.4/lib/bundler/cli.rb:452:in 'Bundler::CLI#exec' /usr/local/lib/ruby/gems/3.4.0/gems/bundler-2.6.4/lib/bundler/vendor/thor/lib/thor/command.rb:28:in 'Bundler::Thor::Command#run' /usr/local/lib/ruby/gems/3.4.0/gems/bundler-2.6.4/lib/bundler/vendor/thor/lib/thor/invocation.rb:127:in 'Bundler::Thor::Invocation#invoke_command' /usr/local/lib/ruby/gems/3.4.0/gems/bundler-2.6.4/lib/bundler/vendor/thor/lib/thor.rb:538:in 'Bundler::Thor.dispatch' /usr/local/lib/ruby/gems/3.4.0/gems/bundler-2.6.4/lib/bundler/cli.rb:35:in 'Bundler::CLI.dispatch' /usr/local/lib/ruby/gems/3.4.0/gems/bundler-2.6.4/lib/bundler/vendor/thor/lib/thor/base.rb:584:in 'Bundler::Thor::Base::ClassMethods#start' /usr/local/lib/ruby/gems/3.4.0/gems/bundler-2.6.4/lib/bundler/cli.rb:29:in 'Bundler::CLI.start' /usr/local/lib/ruby/gems/3.4.0/gems/bundler-2.6.4/exe/bundle:28:in 'block in ' /usr/local/lib/ruby/gems/3.4.0/gems/bundler-2.6.4/lib/bundler/friendly_errors.rb:117:in 'Bundler.with_friendly_errors' /usr/local/lib/ruby/gems/3.4.0/gems/bundler-2.6.4/exe/bundle:20:in ' ' /usr/local/bin/bundle:25:in 'Kernel#load' /usr/local/bin/bundle:25:in ' ' Deleting old backups... Cleaning stuff up... Removing archive from local storage... Removing '.tar' leftovers... Marking backup as finished... Notifying 'system' of the end of the backup... Finished! [FAILED]

Ok, that made the trick. Finished! [SUCCESS] Backup done. Output file is stored on S3

Error uploading backup to B2

Product Support

supermathie (Michael Brown) January 16, 2026, 4:17pm 4

Presuming it stopped working after an upgrade, do you know the version where it was working (knowing the filename of the last successful backup would help) and the version you’re at now?

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Error uploading backup to B2

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