I tried reducing the block size down to 20MB to see if that would help (say if its timing out for some reason due to my slow connection). Anyway same errors. This is an extract from the live log, nothing is getting uploaded looking at B2 bucket online:
* 4 Mar 2020 12:40: Backend event: Put - Started: duplicati-bf0193e85513742b59f69572158ec8bf3.dblock.zip.aes (19.98 MB)
* 4 Mar 2020 12:40: ExecuteScalarInt64: INSERT INTO "Remotevolume" ("OperationID", "Name", "Type", "State", "Size", "VerificationCount", "DeleteGraceTime") VALUES (7, "duplicati-bb3bff12f540e4e3fb9855f6cb1176e09.dblock.zip.aes", "Blocks", "Deleting", -1, 0, 0); SELECT last_insert_rowid(); took 0:00:00:00.000
* 4 Mar 2020 12:40: Starting - ExecuteScalarInt64: INSERT INTO "Remotevolume" ("OperationID", "Name", "Type", "State", "Size", "VerificationCount", "DeleteGraceTime") VALUES (7, "duplicati-bb3bff12f540e4e3fb9855f6cb1176e09.dblock.zip.aes", "Blocks", "Deleting", -1, 0, 0); SELECT last_insert_rowid();
* 4 Mar 2020 12:40: ExecuteScalar: SELECT "Type" FROM "Remotevolume" WHERE "Name" = "duplicati-bf0193e85513742b59f69572158ec8bf3.dblock.zip.aes" took 0:00:00:00.000
* 4 Mar 2020 12:40: Starting - ExecuteScalar: SELECT "Type" FROM "Remotevolume" WHERE "Name" = "duplicati-bf0193e85513742b59f69572158ec8bf3.dblock.zip.aes"
* 4 Mar 2020 12:40: ExecuteNonQuery: UPDATE "Remotevolume" SET "Name" = "duplicati-bf0193e85513742b59f69572158ec8bf3.dblock.zip.aes" WHERE "Name" = "duplicati-bb3bff12f540e4e3fb9855f6cb1176e09.dblock.zip.aes" took 0:00:00:00.000
* 4 Mar 2020 12:40: Starting - ExecuteNonQuery: UPDATE "Remotevolume" SET "Name" = "duplicati-bf0193e85513742b59f69572158ec8bf3.dblock.zip.aes" WHERE "Name" = "duplicati-bb3bff12f540e4e3fb9855f6cb1176e09.dblock.zip.aes"
* 4 Mar 2020 12:40: Renaming "duplicati-bb3bff12f540e4e3fb9855f6cb1176e09.dblock.zip.aes" to "duplicati-bf0193e85513742b59f69572158ec8bf3.dblock.zip.aes"
* 4 Mar 2020 12:40: Backend event: Put - Rename: duplicati-bf0193e85513742b59f69572158ec8bf3.dblock.zip.aes (19.98 MB)
* 4 Mar 2020 12:40: Backend event: Put - Rename: duplicati-bb3bff12f540e4e3fb9855f6cb1176e09.dblock.zip.aes (19.98 MB)
* 4 Mar 2020 12:40: Backend event: Put - Retrying: duplicati-bb3bff12f540e4e3fb9855f6cb1176e09.dblock.zip.aes (19.98 MB)
* 4 Mar 2020 12:40: Operation Put with file duplicati-bb3bff12f540e4e3fb9855f6cb1176e09.dblock.zip.aes attempt 3 of 5 failed with message: Unable to read data from the transport connection: The connection was closed.
* 4 Mar 2020 12:37: Backend event: Put - Started: duplicati-b088aa22572d8424ab19088289434046f.dblock.zip.aes (19.98 MB)
* 4 Mar 2020 12:37: ExecuteScalarInt64: INSERT INTO "Remotevolume" ("OperationID", "Name", "Type", "State", "Size", "VerificationCount", "DeleteGraceTime") VALUES (7, "duplicati-b7a9317d8bb854a91b7a048403f2c072f.dblock.zip.aes", "Blocks", "Deleting", -1, 0, 0); SELECT last_insert_rowid(); took 0:00:00:00.000
* 4 Mar 2020 12:37: Starting - ExecuteScalarInt64: INSERT INTO "Remotevolume" ("OperationID", "Name", "Type", "State", "Size", "VerificationCount", "DeleteGraceTime") VALUES (7, "duplicati-b7a9317d8bb854a91b7a048403f2c072f.dblock.zip.aes", "Blocks", "Deleting", -1, 0, 0); SELECT last_insert_rowid();
* 4 Mar 2020 12:37: ExecuteScalar: SELECT "Type" FROM "Remotevolume" WHERE "Name" = "duplicati-b088aa22572d8424ab19088289434046f.dblock.zip.aes" took 0:00:00:00.000
* 4 Mar 2020 12:37: Starting - ExecuteScalar: SELECT "Type" FROM "Remotevolume" WHERE "Name" = "duplicati-b088aa22572d8424ab19088289434046f.dblock.zip.aes"
* 4 Mar 2020 12:37: ExecuteNonQuery: UPDATE "Remotevolume" SET "Name" = "duplicati-b088aa22572d8424ab19088289434046f.dblock.zip.aes" WHERE "Name" = "duplicati-b7a9317d8bb854a91b7a048403f2c072f.dblock.zip.aes" took 0:00:00:00.000
* 4 Mar 2020 12:37: Starting - ExecuteNonQuery: UPDATE "Remotevolume" SET "Name" = "duplicati-b088aa22572d8424ab19088289434046f.dblock.zip.aes" WHERE "Name" = "duplicati-b7a9317d8bb854a91b7a048403f2c072f.dblock.zip.aes"
* 4 Mar 2020 12:37: Renaming "duplicati-b7a9317d8bb854a91b7a048403f2c072f.dblock.zip.aes" to "duplicati-b088aa22572d8424ab19088289434046f.dblock.zip.aes"
* 4 Mar 2020 12:37: Backend event: Put - Rename: duplicati-b088aa22572d8424ab19088289434046f.dblock.zip.aes (19.98 MB)
* 4 Mar 2020 12:37: Backend event: Put - Rename: duplicati-b7a9317d8bb854a91b7a048403f2c072f.dblock.zip.aes (19.98 MB)
* 4 Mar 2020 12:37: Backend event: Put - Retrying: duplicati-b7a9317d8bb854a91b7a048403f2c072f.dblock.zip.aes (19.98 MB)
* 4 Mar 2020 12:37: Operation Put with file duplicati-b7a9317d8bb854a91b7a048403f2c072f.dblock.zip.aes attempt 3 of 5 failed with message: Unable to read data from the transport connection: The connection was closed.
* 4 Mar 2020 12:37: Backend event: Put - Started: duplicati-bb3bff12f540e4e3fb9855f6cb1176e09.dblock.zip.aes (19.98 MB)
* 4 Mar 2020 12:37: ExecuteScalarInt64: INSERT INTO "Remotevolume" ("OperationID", "Name", "Type", "State", "Size", "VerificationCount", "DeleteGraceTime") VALUES (7, "duplicati-ba102769d04914f0bb8e6276d9a8c3fe2.dblock.zip.aes", "Blocks", "Deleting", -1, 0, 0); SELECT last_insert_rowid(); took 0:00:00:00.000
* 4 Mar 2020 12:37: Starting - ExecuteScalarInt64: INSERT INTO "Remotevolume" ("OperationID", "Name", "Type", "State", "Size", "VerificationCount", "DeleteGraceTime") VALUES (7, "duplicati-ba102769d04914f0bb8e6276d9a8c3fe2.dblock.zip.aes", "Blocks", "Deleting", -1, 0, 0); SELECT last_insert_rowid();
* 4 Mar 2020 12:37: ExecuteScalar: SELECT "Type" FROM "Remotevolume" WHERE "Name" = "duplicati-bb3bff12f540e4e3fb9855f6cb1176e09.dblock.zip.aes" took 0:00:00:00.000
* 4 Mar 2020 12:37: Starting - ExecuteScalar: SELECT "Type" FROM "Remotevolume" WHERE "Name" = "duplicati-bb3bff12f540e4e3fb9855f6cb1176e09.dblock.zip.aes"
* 4 Mar 2020 12:37: ExecuteNonQuery: UPDATE "Remotevolume" SET "Name" = "duplicati-bb3bff12f540e4e3fb9855f6cb1176e09.dblock.zip.aes" WHERE "Name" = "duplicati-ba102769d04914f0bb8e6276d9a8c3fe2.dblock.zip.aes" took 0:00:00:00.000
* 4 Mar 2020 12:37: Starting - ExecuteNonQuery: UPDATE "Remotevolume" SET "Name" = "duplicati-bb3bff12f540e4e3fb9855f6cb1176e09.dblock.zip.aes" WHERE "Name" = "duplicati-ba102769d04914f0bb8e6276d9a8c3fe2.dblock.zip.aes"
* 4 Mar 2020 12:37: Renaming "duplicati-ba102769d04914f0bb8e6276d9a8c3fe2.dblock.zip.aes" to "duplicati-bb3bff12f540e4e3fb9855f6cb1176e09.dblock.zip.aes"
* 4 Mar 2020 12:37: Backend event: Put - Rename: duplicati-bb3bff12f540e4e3fb9855f6cb1176e09.dblock.zip.aes (19.98 MB)
* 4 Mar 2020 12:37: Backend event: Put - Rename: duplicati-ba102769d04914f0bb8e6276d9a8c3fe2.dblock.zip.aes (19.98 MB)
* 4 Mar 2020 12:37: Backend event: Put - Retrying: duplicati-ba102769d04914f0bb8e6276d9a8c3fe2.dblock.zip.aes (19.98 MB)
* 4 Mar 2020 12:37: Operation Put with file duplicati-ba102769d04914f0bb8e6276d9a8c3fe2.dblock.zip.aes attempt 2 of 5 failed with message: Unable to read data from the transport connection: The connection was closed.
* 4 Mar 2020 12:36: Backend event: Put - Started: duplicati-bbe463b3c1cc641c99dd9f90d837766a6.dblock.zip.aes (19.94 MB)
* 4 Mar 2020 12:36: ExecuteScalarInt64: INSERT INTO "Remotevolume" ("OperationID", "Name", "Type", "State", "Size", "VerificationCount", "DeleteGraceTime") VALUES (7, "duplicati-b64c0cd1421694190b40180fb1170d615.dblock.zip.aes", "Blocks", "Deleting", -1, 0, 0); SELECT last_insert_rowid(); took 0:00:00:00.000
* 4 Mar 2020 12:36: Starting - ExecuteScalarInt64: INSERT INTO "Remotevolume" ("OperationID", "Name", "Type", "State", "Size", "VerificationCount", "DeleteGraceTime") VALUES (7, "duplicati-b64c0cd1421694190b40180fb1170d615.dblock.zip.aes", "Blocks", "Deleting", -1, 0, 0); SELECT last_insert_rowid();
* 4 Mar 2020 12:36: ExecuteScalar: SELECT "Type" FROM "Remotevolume" WHERE "Name" = "duplicati-bbe463b3c1cc641c99dd9f90d837766a6.dblock.zip.aes" took 0:00:00:00.000
* 4 Mar 2020 12:36: Starting - ExecuteScalar: SELECT "Type" FROM "Remotevolume" WHERE "Name" = "duplicati-bbe463b3c1cc641c99dd9f90d837766a6.dblock.zip.aes"
* 4 Mar 2020 12:36: ExecuteNonQuery: UPDATE "Remotevolume" SET "Name" = "duplicati-bbe463b3c1cc641c99dd9f90d837766a6.dblock.zip.aes" WHERE "Name" = "duplicati-b64c0cd1421694190b40180fb1170d615.dblock.zip.aes" took 0:00:00:00.000
* 4 Mar 2020 12:36: Starting - ExecuteNonQuery: UPDATE "Remotevolume" SET "Name" = "duplicati-bbe463b3c1cc641c99dd9f90d837766a6.dblock.zip.aes" WHERE "Name" = "duplicati-b64c0cd1421694190b40180fb1170d615.dblock.zip.aes"
* 4 Mar 2020 12:36: Renaming "duplicati-b64c0cd1421694190b40180fb1170d615.dblock.zip.aes" to "duplicati-bbe463b3c1cc641c99dd9f90d837766a6.dblock.zip.aes"
* 4 Mar 2020 12:36: Backend event: Put - Rename: duplicati-bbe463b3c1cc641c99dd9f90d837766a6.dblock.zip.aes (19.94 MB)
* 4 Mar 2020 12:36: Backend event: Put - Rename: duplicati-b64c0cd1421694190b40180fb1170d615.dblock.zip.aes (19.94 MB)
* 4 Mar 2020 12:36: Backend event: Put - Retrying: duplicati-b64c0cd1421694190b40180fb1170d615.dblock.zip.aes (19.94 MB)
* 4 Mar 2020 12:36: Operation Put with file duplicati-b64c0cd1421694190b40180fb1170d615.dblock.zip.aes attempt 2 of 5 failed with message: Unable to read data from the transport connection: The connection was closed.
* 4 Mar 2020 12:35: Backend event: Put - Started: duplicati-b7a9317d8bb854a91b7a048403f2c072f.dblock.zip.aes (19.98 MB)
* 4 Mar 2020 12:35: ExecuteScalarInt64: INSERT INTO "Remotevolume" ("OperationID", "Name", "Type", "State", "Size", "VerificationCount", "DeleteGraceTime") VALUES (7, "duplicati-bafb2f9e34439415f880ecd85692c725c.dblock.zip.aes", "Blocks", "Deleting", -1, 0, 0); SELECT last_insert_rowid(); took 0:00:00:00.000
* 4 Mar 2020 12:35: Starting - ExecuteScalarInt64: INSERT INTO "Remotevolume" ("OperationID", "Name", "Type", "State", "Size", "VerificationCount", "DeleteGraceTime") VALUES (7, "duplicati-bafb2f9e34439415f880ecd85692c725c.dblock.zip.aes", "Blocks", "Deleting", -1, 0, 0); SELECT last_insert_rowid();
* 4 Mar 2020 12:35: ExecuteScalar: SELECT "Type" FROM "Remotevolume" WHERE "Name" = "duplicati-b7a9317d8bb854a91b7a048403f2c072f.dblock.zip.aes" took 0:00:00:00.000
* 4 Mar 2020 12:35: Starting - ExecuteScalar: SELECT "Type" FROM "Remotevolume" WHERE "Name" = "duplicati-b7a9317d8bb854a91b7a048403f2c072f.dblock.zip.aes"
* 4 Mar 2020 12:35: ExecuteNonQuery: UPDATE "Remotevolume" SET "Name" = "duplicati-b7a9317d8bb854a91b7a048403f2c072f.dblock.zip.aes" WHERE "Name" = "duplicati-bafb2f9e34439415f880ecd85692c725c.dblock.zip.aes" took 0:00:00:00.000
* 4 Mar 2020 12:35: Starting - ExecuteNonQuery: UPDATE "Remotevolume" SET "Name" = "duplicati-b7a9317d8bb854a91b7a048403f2c072f.dblock.zip.aes" WHERE "Name" = "duplicati-bafb2f9e34439415f880ecd85692c725c.dblock.zip.aes"
* 4 Mar 2020 12:35: Renaming "duplicati-bafb2f9e34439415f880ecd85692c725c.dblock.zip.aes" to "duplicati-b7a9317d8bb854a91b7a048403f2c072f.dblock.zip.aes"
* 4 Mar 2020 12:35: Backend event: Put - Rename: duplicati-b7a9317d8bb854a91b7a048403f2c072f.dblock.zip.aes (19.98 MB)
* 4 Mar 2020 12:35: Backend event: Put - Rename: duplicati-bafb2f9e34439415f880ecd85692c725c.dblock.zip.aes (19.98 MB)
* 4 Mar 2020 12:35: Backend event: Put - Retrying: duplicati-bafb2f9e34439415f880ecd85692c725c.dblock.zip.aes (19.98 MB)
* 4 Mar 2020 12:35: Operation Put with file duplicati-bafb2f9e34439415f880ecd85692c725c.dblock.zip.aes attempt 2 of 5 failed with message: Unable to read data from the transport connection: The connection was closed.
* 4 Mar 2020 12:32: Backend event: Put - Started: duplicati-ba102769d04914f0bb8e6276d9a8c3fe2.dblock.zip.aes (19.98 MB)
* 4 Mar 2020 12:32: Renaming "duplicati-bf76ba357824547889629dc6687b5f239.dblock.zip.aes" to "duplicati-ba102769d04914f0bb8e6276d9a8c3fe2.dblock.zip.aes"
* 4 Mar 2020 12:32: Backend event: Put - Rename: duplicati-ba102769d04914f0bb8e6276d9a8c3fe2.dblock.zip.aes (19.98 MB)
* 4 Mar 2020 12:32: Backend event: Put - Rename: duplicati-bf76ba357824547889629dc6687b5f239.dblock.zip.aes (19.98 MB)
* 4 Mar 2020 12:32: Backend event: Put - Started: duplicati-b64c0cd1421694190b40180fb1170d615.dblock.zip.aes (19.94 MB)
* 4 Mar 2020 12:32: Renaming "duplicati-b3a0375f5d7424b33882504aa28daca0e.dblock.zip.aes" to "duplicati-b64c0cd1421694190b40180fb1170d615.dblock.zip.aes"
* 4 Mar 2020 12:32: Backend event: Put - Rename: duplicati-b64c0cd1421694190b40180fb1170d615.dblock.zip.aes (19.94 MB)
* 4 Mar 2020 12:32: Backend event: Put - Rename: duplicati-b3a0375f5d7424b33882504aa28daca0e.dblock.zip.aes (19.94 MB)
* 4 Mar 2020 12:32: Backend event: Put - Retrying: duplicati-bf76ba357824547889629dc6687b5f239.dblock.zip.aes (19.98 MB)
* 4 Mar 2020 12:32: Backend event: Put - Retrying: duplicati-b3a0375f5d7424b33882504aa28daca0e.dblock.zip.aes (19.94 MB)
* 4 Mar 2020 12:32: Backend event: Put - Started: duplicati-b94de90c139c94a9ead4a1ad3311d1334.dblock.zip.aes (19.98 MB)