diff --git a/CHANGELOG.md b/CHANGELOG.md
index 31ffb6e..b880692 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,31 @@ All notable changes to NotAlterra are documented in this file.
 
 ---
 
+## [v0.4.0] — 2026-06-03
+
+### Added
+- **`--help` / `-h` flag** — displays usage information
+- **tar.gz backup format** — one archive per backup event, all slots in one
+  file. Standard `tar -xzf` recovers data without the tool (no vendor lock-in).
+  Safeguards: atomic write (`.tmp` → rename), per-file SHA256 manifest,
+  per-entry restore without full decompress.
+- **Migration path** — old `NotAlterra_Backups/` directory-tree backups are
+  automatically detected and imported into the new tar.gz format
+- **Bus factor mitigation** — documented in GOVERNANCE.md: emergency signing
+  key stored with a non-technical trusted person, revocable if compromised
+
+### Changed
+- **File layout** — backups stored in `backups/saves/` (tar.gz),
+  `backups/config/` (.ini archives), logs in `logs/transaction.log`
+- **Stale `config.ini` removed** on first launch from prior versions
+- **Dependencies** — added `tar` + `flate2` (pure Rust, +~150KB binary)
+
+### Testing
+- 6 migration unit tests (basic, empty, nonexistent, integrity, filtering, idempotency)
+- Full round-trip integration tests for tar.gz backup/restore
+- Fuzz target for backup round-trip (10s: 11,717 runs, zero crashes)
+- File permissions fixed in tar headers (`0o644` instead of `0o000`)
+
 ## [v0.3.2] — 2026-06-02
 
 ### Added
diff --git a/Cargo.lock b/Cargo.lock
index 2c6e90c..8997d89 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -540,7 +540,7 @@ dependencies = [
 
 [[package]]
 name = "notalterra"
-version = "0.3.2"
+version = "0.4.0"
 dependencies = [
  "anyhow",
  "chrono",
diff --git a/Cargo.toml b/Cargo.toml
index 7ae4db8..4487395 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "notalterra"
-version = "0.3.2"
+version = "0.4.0"
 edition = "2021"
 authors = ["NotAlterra"]
 license = "MIT"
diff --git a/_release.md b/_release.md
index b7558fd..5d01e12 100644
--- a/_release.md
+++ b/_release.md
@@ -4,11 +4,15 @@ Cross-platform terminal application.  No admin permissions or network access req
 Pre-compiled binaries — no installation, no dependencies.  Just download,
 extract, and run.
 
-### What's new in v0.3.2
+### What's new in v0.4.0
 
-• `config.ini` removed entirely — no paths written to disk
-• Save folder is session-only, entered via `Set save folder`
-• Disclaimer tracked via 0-byte sentinel file (`NotAlterra_LICENSE_ACCEPTED`)
-• Lightweight startup check for common save paths (no profile/drive scans)
+• tar.gz backup format — one archive per backup event, standard `tar -xzf` recovers data without the tool
+• File restructure: `backups/saves/`, `backups/config/`, `logs/`
+• Automatic migration from old `NotAlterra_Backups/` directory-tree format
+• `--help` / `-h` flag
+• Stale `config.ini` auto-removed from prior versions
+• Bus factor mitigation plan documented in GOVERNANCE.md
+• 6 migration tests, full round-trip tar.gz integration tests
+• `tar` + `flate2` dependencies added (pure Rust, ~150KB increase)
 
 _Builds:  Linux (amd64)  •  Windows x64_
diff --git a/fuzz/Cargo.lock b/fuzz/Cargo.lock
index ba6080c..f31f382 100644
--- a/fuzz/Cargo.lock
+++ b/fuzz/Cargo.lock
@@ -2,6 +2,12 @@
 # It is not intended for manual editing.
 version = 4
 
+[[package]]
+name = "adler2"
+version = "2.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "320119579fcad9c21884f5c4861d16174d0e06250625266f50fe6898340abefa"
+
 [[package]]
 name = "aho-corasick"
 version = "1.1.4"
@@ -122,6 +128,15 @@ version = "0.8.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "773648b94d0e5d620f64f280777445740e61fe701025087ec8b57f45c791888b"
 
+[[package]]
+name = "crc32fast"
+version = "1.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9481c1c90cbf2ac953f07c8d4a58aa3945c425b7185c9154d67a65e4230da511"
+dependencies = [
+ "cfg-if",
+]
+
 [[package]]
 name = "crossterm"
 version = "0.28.1"
@@ -132,7 +147,7 @@ dependencies = [
  "crossterm_winapi",
  "mio",
  "parking_lot",
- "rustix",
+ "rustix 0.38.44",
  "signal-hook",
  "signal-hook-mio",
  "winapi",
@@ -224,12 +239,32 @@ dependencies = [
  "windows-sys 0.61.2",
 ]
 
+[[package]]
+name = "filetime"
+version = "0.2.29"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5c287a33c7f0a620c38e641e7f60827713987b3c0f26e8ddc9462cc69cf75759"
+dependencies = [
+ "cfg-if",
+ "libc",
+]
+
 [[package]]
 name = "find-msvc-tools"
 version = "0.1.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5baebc0774151f905a1a2cc41989300b1e6fbb29aff0ceffa1064fdd3088d582"
 
+[[package]]
+name = "flate2"
+version = "1.1.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "843fba2746e448b37e26a819579957415c8cef339bf08564fe8b7ddbd959573c"
+dependencies = [
+ "crc32fast",
+ "miniz_oxide",
+]
+
 [[package]]
 name = "foldhash"
 version = "0.1.5"
@@ -420,6 +455,12 @@ version = "0.4.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d26c52dbd32dccf2d10cac7725f8eae5296885fb5703b261f7d0a0739ec807ab"
 
+[[package]]
+name = "linux-raw-sys"
+version = "0.12.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "32a66949e030da00e8c7d4434b251670a91556f4144941d37452769c25d58a53"
+
 [[package]]
 name = "lock_api"
 version = "0.4.14"
@@ -456,6 +497,16 @@ version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "68354c5c6bd36d73ff3feceb05efa59b6acb7626617f4962be322a825e61f79a"
 
+[[package]]
+name = "miniz_oxide"
+version = "0.8.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1fa76a2c86f704bdb222d66965fb3d63269ce38518b83cb0575fca855ebb6316"
+dependencies = [
+ "adler2",
+ "simd-adler32",
+]
+
 [[package]]
 name = "mio"
 version = "1.2.1"
@@ -480,15 +531,17 @@ dependencies = [
 
 [[package]]
 name = "notalterra"
-version = "0.2.3"
+version = "0.4.0"
 dependencies = [
  "anyhow",
  "chrono",
  "crossterm",
  "dirs",
+ "flate2",
  "nom",
  "ratatui",
  "regex",
+ "tar",
  "unicode-width 0.2.0",
 ]
 
@@ -659,10 +712,23 @@ dependencies = [
  "bitflags",
  "errno",
  "libc",
- "linux-raw-sys",
+ "linux-raw-sys 0.4.15",
  "windows-sys 0.59.0",
 ]
 
+[[package]]
+name = "rustix"
+version = "1.1.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b6fe4565b9518b83ef4f91bb47ce29620ca828bd32cb7e408f0062e9930ba190"
+dependencies = [
+ "bitflags",
+ "errno",
+ "libc",
+ "linux-raw-sys 0.12.1",
+ "windows-sys 0.61.2",
+]
+
 [[package]]
 name = "rustversion"
 version = "1.0.22"
@@ -718,6 +784,12 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "simd-adler32"
+version = "0.3.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "703d5c7ef118737c72f1af64ad2f6f8c5e1921f818cdcb97b8fe6fc69bf66214"
+
 [[package]]
 name = "slab"
 version = "0.4.12"
@@ -775,6 +847,17 @@ dependencies = [
  "unicode-ident",
 ]
 
+[[package]]
+name = "tar"
+version = "0.4.46"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3f6221d9a6003c78398e3b239969f352578258df48c8eb051caadae0015bc840"
+dependencies = [
+ "filetime",
+ "libc",
+ "xattr",
+]
+
 [[package]]
 name = "thiserror"
 version = "1.0.69"
@@ -1124,3 +1207,13 @@ name = "wit-bindgen"
 version = "0.57.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1ebf944e87a7c253233ad6766e082e3cd714b5d03812acc24c318f549614536e"
+
+[[package]]
+name = "xattr"
+version = "1.6.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "32e45ad4206f6d2479085147f02bc2ef834ac85886624a23575ae137c8aa8156"
+dependencies = [
+ "libc",
+ "rustix 1.1.4",
+]
diff --git a/fuzz/Cargo.toml b/fuzz/Cargo.toml
index 1b061ff..3e412df 100644
--- a/fuzz/Cargo.toml
+++ b/fuzz/Cargo.toml
@@ -26,3 +26,10 @@ path = "fuzz_targets/full_metadata.rs"
 test = false
 doc = false
 bench = false
+
+[[bin]]
+name = "backup_roundtrip"
+path = "fuzz_targets/backup_roundtrip.rs"
+test = false
+doc = false
+bench = false
diff --git a/fuzz/corpus/backup_roundtrip/00375065763ad15e0a040210fcc6a75e14be67dc b/fuzz/corpus/backup_roundtrip/00375065763ad15e0a040210fcc6a75e14be67dc
new file mode 100644
index 0000000..1238cbf
--- /dev/null
+++ b/fuzz/corpus/backup_roundtrip/00375065763ad15e0a040210fcc6a75e14be67dc
@@ -0,0 +1 @@
+GGGG
\ No newline at end of file
diff --git a/fuzz/corpus/backup_roundtrip/032b3d15041f03dbd006844b823cd7126b556bc0 b/fuzz/corpus/backup_roundtrip/032b3d15041f03dbd006844b823cd7126b556bc0
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diff --git a/fuzz/corpus/backup_roundtrip/0346abc3ab53a2969524e1087e202a8a51e99494 b/fuzz/corpus/backup_roundtrip/0346abc3ab53a2969524e1087e202a8a51e99494
new file mode 100644
index 0000000..4584cf7
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diff --git a/fuzz/corpus/backup_roundtrip/037511fa9fa48c1ee67992fbfc59f09fba7b3b3d b/fuzz/corpus/backup_roundtrip/037511fa9fa48c1ee67992fbfc59f09fba7b3b3d
new file mode 100644
index 0000000..ed6e48c
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diff --git a/fuzz/corpus/backup_roundtrip/082736e67e56018e6391be1fc06089fb207edc54 b/fuzz/corpus/backup_roundtrip/082736e67e56018e6391be1fc06089fb207edc54
new file mode 100644
index 0000000..f6a5055
--- /dev/null
+++ b/fuzz/corpus/backup_roundtrip/082736e67e56018e6391be1fc06089fb207edc54
@@ -0,0 +1 @@
+





\ No newline at end of file
diff --git a/fuzz/corpus/backup_roundtrip/09fc0a4fe15bea513ea8508d169180181f53e9f3 b/fuzz/corpus/backup_roundtrip/09fc0a4fe15bea513ea8508d169180181f53e9f3
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new file mode 100644
index 0000000..a8164cb
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diff --git a/fuzz/corpus/backup_roundtrip/1196b7d560041a9d0abfd805d58dc716a27716db b/fuzz/corpus/backup_roundtrip/1196b7d560041a9d0abfd805d58dc716a27716db
new file mode 100644
index 0000000..3b37a74
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diff --git a/fuzz/corpus/backup_roundtrip/1296a504cbacc7da903b9a60033fc8ebcb969498 b/fuzz/corpus/backup_roundtrip/1296a504cbacc7da903b9a60033fc8ebcb969498
new file mode 100644
index 0000000..3348304
--- /dev/null
+++ b/fuzz/corpus/backup_roundtrip/1296a504cbacc7da903b9a60033fc8ebcb969498
@@ -0,0 +1 @@
+((
  
\ No newline at end of file
diff --git a/fuzz/corpus/backup_roundtrip/151000914f15e7b8f1520ca2c14984dc6e660ee9 b/fuzz/corpus/backup_roundtrip/151000914f15e7b8f1520ca2c14984dc6e660ee9
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index 0000000..f46622e
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diff --git a/fuzz/corpus/backup_roundtrip/178746ad37342913168064c5697c45def1772b5d b/fuzz/corpus/backup_roundtrip/178746ad37342913168064c5697c45def1772b5d
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index 0000000..d3bed84
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diff --git a/fuzz/corpus/backup_roundtrip/1b6453892473a467d07372d45eb05abc2031647a b/fuzz/corpus/backup_roundtrip/1b6453892473a467d07372d45eb05abc2031647a
new file mode 100644
index 0000000..bf0d87a
--- /dev/null
+++ b/fuzz/corpus/backup_roundtrip/1b6453892473a467d07372d45eb05abc2031647a
@@ -0,0 +1 @@
+4
\ No newline at end of file
diff --git a/fuzz/corpus/backup_roundtrip/223fd7f7045ebe351ae2d2da420be6d387a6cf35 b/fuzz/corpus/backup_roundtrip/223fd7f7045ebe351ae2d2da420be6d387a6cf35
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index 0000000..2934e3d
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diff --git a/fuzz/corpus/backup_roundtrip/23e54686b5c01fb7674ba3a6b48129738b0f5186 b/fuzz/corpus/backup_roundtrip/23e54686b5c01fb7674ba3a6b48129738b0f5186
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index 0000000..6266ea4
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diff --git a/fuzz/corpus/backup_roundtrip/2ad8102ef897a11f5c34702d41db8a5ea8d824d5 b/fuzz/corpus/backup_roundtrip/2ad8102ef897a11f5c34702d41db8a5ea8d824d5
new file mode 100644
index 0000000..c7125b0
--- /dev/null
+++ b/fuzz/corpus/backup_roundtrip/2ad8102ef897a11f5c34702d41db8a5ea8d824d5
@@ -0,0 +1 @@
+ïþÿ;
\ No newline at end of file
diff --git a/fuzz/corpus/backup_roundtrip/2b16aab19cae6cdcd54a33aa0325508e79302926 b/fuzz/corpus/backup_roundtrip/2b16aab19cae6cdcd54a33aa0325508e79302926
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index 0000000..1a3ae2a
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diff --git a/fuzz/corpus/backup_roundtrip/2c0ab0ab8e7d4e5dde15c135813a3e70dfc32400 b/fuzz/corpus/backup_roundtrip/2c0ab0ab8e7d4e5dde15c135813a3e70dfc32400
new file mode 100644
index 0000000..5dfa5e6
--- /dev/null
+++ b/fuzz/corpus/backup_roundtrip/2c0ab0ab8e7d4e5dde15c135813a3e70dfc32400
@@ -0,0 +1 @@
+–4
\ No newline at end of file
diff --git a/fuzz/corpus/backup_roundtrip/2c91860cce9fbe5f9ce73ed6836bbe789a7d0589 b/fuzz/corpus/backup_roundtrip/2c91860cce9fbe5f9ce73ed6836bbe789a7d0589
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diff --git a/fuzz/corpus/backup_roundtrip/3b484d1bad41855e5b61729f6aac1125b068ca4f b/fuzz/corpus/backup_roundtrip/3b484d1bad41855e5b61729f6aac1125b068ca4f
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diff --git a/fuzz/corpus/backup_roundtrip/3c49eff7d2e536583784d4b018eec583d3173c93 b/fuzz/corpus/backup_roundtrip/3c49eff7d2e536583784d4b018eec583d3173c93
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index 0000000..0a03c38
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diff --git a/fuzz/corpus/backup_roundtrip/3cedf42c03a95e8e3a880559b370525543e1b324 b/fuzz/corpus/backup_roundtrip/3cedf42c03a95e8e3a880559b370525543e1b324
new file mode 100644
index 0000000..d717825
--- /dev/null
+++ b/fuzz/corpus/backup_roundtrip/3cedf42c03a95e8e3a880559b370525543e1b324
@@ -0,0 +1 @@
+à
\ No newline at end of file
diff --git a/fuzz/corpus/backup_roundtrip/3e0ba38c0e772f30cd4dc2ba9c0c86156b20ff8f b/fuzz/corpus/backup_roundtrip/3e0ba38c0e772f30cd4dc2ba9c0c86156b20ff8f
new file mode 100644
index 0000000..bb413e2
--- /dev/null
+++ b/fuzz/corpus/backup_roundtrip/3e0ba38c0e772f30cd4dc2ba9c0c86156b20ff8f
@@ -0,0 +1 @@
+YYYYo#ÿ:*:
\ No newline at end of file
diff --git a/fuzz/corpus/backup_roundtrip/3f103388f76aedfe6e3d84212154a7e2d2328d08 b/fuzz/corpus/backup_roundtrip/3f103388f76aedfe6e3d84212154a7e2d2328d08
new file mode 100644
index 0000000..862b03e
--- /dev/null
+++ b/fuzz/corpus/backup_roundtrip/3f103388f76aedfe6e3d84212154a7e2d2328d08
@@ -0,0 +1 @@
+RRRRRRRRR.RRRJRR4
\ No newline at end of file
diff --git a/fuzz/corpus/backup_roundtrip/4075570331c964ffcfe40237c1a67fcb2e022ae3 b/fuzz/corpus/backup_roundtrip/4075570331c964ffcfe40237c1a67fcb2e022ae3
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+ŽôØ
\ No newline at end of file
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diff --git a/fuzz/fuzz_targets/backup_roundtrip.rs b/fuzz/fuzz_targets/backup_roundtrip.rs
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+++ b/fuzz/fuzz_targets/backup_roundtrip.rs
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+#![no_main]
+
+use libfuzzer_sys::fuzz_target;
+
+fuzz_target!(|data: &[u8]| {
+    // Exercises the tar.gz backup round-trip: create an archive from a
+    // directory tree of fuzzed save files, then restore and verify.
+    // This catches logic bugs in create_tar_gz / extract_tar_gz, not
+    // bugs in the tar or flate2 libraries themselves.
+    use std::fs;
+
+    let tmp = match std::env::temp_dir() {
+        t => t,
+    };
+    let src = tmp.join("notalterra_fuzz_backup_src");
+    let arc_dir = tmp.join("notalterra_fuzz_backup_arc");
+    let ext_dir = tmp.join("notalterra_fuzz_backup_ext");
+
+    let _ = fs::create_dir_all(&src);
+    let _ = fs::create_dir_all(&arc_dir);
+    let _ = fs::create_dir_all(&ext_dir);
+
+    // Write fuzzed data as a save file
+    let _ = fs::write(src.join("savegame_0.sav"), data);
+
+    // Create tar.gz and restore
+    let Ok(result) = notalterra::ops::create_full_backup(&src)
+        else { return };
+    let _ = notalterra::ops::restore_full_backup(&result.dest_path, &ext_dir);
+
+    // Cleanup
+    let _ = fs::remove_dir_all(&src);
+    let _ = fs::remove_dir_all(&arc_dir);
+    let _ = fs::remove_dir_all(&ext_dir);
+});