diff --git a/Cargo.lock b/Cargo.lock
index 39a6fa4..1d4104d 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2,6 +2,15 @@
 # It is not intended for manual editing.
 version = 3
 
+[[package]]
+name = "aho-corasick"
+version = "0.7.18"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1e37cfd5e7657ada45f742d6e99ca5788580b5c529dc78faf11ece6dc702656f"
+dependencies = [
+ "memchr",
+]
+
 [[package]]
 name = "anyhow"
 version = "1.0.57"
@@ -290,6 +299,19 @@ version = "1.6.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e78d4f1cc4ae33bbfc157ed5d5a5ef3bc29227303d595861deb238fcec4e9457"
 
+[[package]]
+name = "env_logger"
+version = "0.7.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "44533bbbb3bb3c1fa17d9f2e4e38bbbaf8396ba82193c4cb1b6445d711445d36"
+dependencies = [
+ "atty",
+ "humantime",
+ "log",
+ "regex",
+ "termcolor",
+]
+
 [[package]]
 name = "fastrand"
 version = "1.7.0"
@@ -520,6 +542,15 @@ version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c4a1e36c821dbe04574f602848a19f742f4fb3c98d40449f11bcad18d6b17421"
 
+[[package]]
+name = "humantime"
+version = "1.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "df004cfca50ef23c36850aaaa59ad52cc70d0e90243c3c7737a4dd32dc7a3c4f"
+dependencies = [
+ "quick-error",
+]
+
 [[package]]
 name = "hyper"
 version = "0.14.18"
@@ -617,10 +648,10 @@ dependencies = [
 [[package]]
 name = "k2v-client"
 version = "0.1.0"
-source = "git+https://git.deuxfleurs.fr/Deuxfleurs/garage.git#64c193e3dbb536d5d3c2881bc9aebbb3e4e6272e"
 dependencies = [
  "base64",
  "http",
+ "log",
  "rusoto_core",
  "rusoto_credential",
  "rusoto_signature",
@@ -676,6 +707,7 @@ dependencies = [
  "im",
  "itertools",
  "k2v-client",
+ "pretty_env_logger",
  "rand",
  "rmp-serde",
  "rpassword",
@@ -876,6 +908,16 @@ version = "0.2.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "eb9f9e6e233e5c4a35559a617bf40a4ec447db2e84c20b55a6f83167b7e57872"
 
+[[package]]
+name = "pretty_env_logger"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "926d36b9553851b8b0005f1275891b392ee4d2d833852c417ed025477350fb9d"
+dependencies = [
+ "env_logger",
+ "log",
+]
+
 [[package]]
 name = "proc-macro-error"
 version = "1.0.4"
@@ -909,6 +951,12 @@ dependencies = [
  "unicode-ident",
 ]
 
+[[package]]
+name = "quick-error"
+version = "1.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a1d01941d82fa2ab50be1e79e6714289dd7cde78eba4c074bc5a4374f650dfe0"
+
 [[package]]
 name = "quote"
 version = "1.0.18"
@@ -977,6 +1025,23 @@ dependencies = [
  "thiserror",
 ]
 
+[[package]]
+name = "regex"
+version = "1.5.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1a11647b6b25ff05a515cb92c365cec08801e83423a235b51e231e1808747286"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-syntax",
+]
+
+[[package]]
+name = "regex-syntax"
+version = "0.6.25"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f497285884f3fcff424ffc933e56d7cbca511def0c9831a7f9b5f6153e3cc89b"
+
 [[package]]
 name = "remove_dir_all"
 version = "0.5.3"
diff --git a/Cargo.toml b/Cargo.toml
index 0205f10..addf945 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -15,6 +15,7 @@ clap = { version = "3.1.18", features = ["derive", "env"] }
 hex = "0.4"
 im = "15"
 itertools = "0.10"
+pretty_env_logger = "0.4"
 rusoto_core = "0.48.0"
 rusoto_credential = "0.48.0"
 rusoto_s3 = "0.48"
@@ -28,4 +29,5 @@ tokio = "1.17.0"
 toml = "0.5"
 zstd = { version = "0.9", default-features = false }
 
-k2v-client = { git = "https://git.deuxfleurs.fr/Deuxfleurs/garage.git" }
+#k2v-client = { git = "https://git.deuxfleurs.fr/Deuxfleurs/garage.git" }
+k2v-client = { path = "../garage/src/k2v-client" }
diff --git a/src/bayou.rs b/src/bayou.rs
index cc83667..56203eb 100644
--- a/src/bayou.rs
+++ b/src/bayou.rs
@@ -19,8 +19,8 @@ const SAVE_STATE_EVERY: usize = 64;
 // Checkpointing interval constants: a checkpoint is not made earlier
 // than CHECKPOINT_INTERVAL time after the last one, and is not made
 // if there are less than CHECKPOINT_MIN_OPS new operations since last one.
-const CHECKPOINT_INTERVAL: Duration = Duration::from_secs(60);
-const CHECKPOINT_MIN_OPS: usize = 4;
+const CHECKPOINT_INTERVAL: Duration = Duration::from_secs(3600);
+const CHECKPOINT_MIN_OPS: usize = 16;
 // HYPOTHESIS: processes are able to communicate in a synchronous
 // fashion in times that are small compared to CHECKPOINT_INTERVAL.
 // More precisely, if a process tried to save an operation within the last
diff --git a/src/login/mod.rs b/src/login/mod.rs
index 3d15d6b..de04126 100644
--- a/src/login/mod.rs
+++ b/src/login/mod.rs
@@ -3,7 +3,7 @@ pub mod static_provider;
 
 use std::collections::BTreeMap;
 
-use anyhow::{anyhow, bail, Result};
+use anyhow::{anyhow, bail, Context, Result};
 use async_trait::async_trait;
 use k2v_client::{
     BatchInsertOp, BatchReadOp, CausalValue, CausalityToken, Filter, K2vClient, K2vValue,
@@ -133,7 +133,8 @@ impl CryptoKeys {
             k2v_insert_single_key("keys", "public", None, &keys.public),
             k2v_insert_single_key("keys", &password_sortkey, None, &password_blob),
         ])
-        .await?;
+        .await
+        .context("InsertBatch for salt, public, and password")?;
 
         Ok(keys)
     }
@@ -164,7 +165,8 @@ impl CryptoKeys {
             k2v_insert_single_key("keys", "salt", None, &ident_salt),
             k2v_insert_single_key("keys", "public", None, &keys.public),
         ])
-        .await?;
+        .await
+        .context("InsertBatch for salt and public")?;
 
         Ok(keys)
     }
@@ -182,7 +184,8 @@ impl CryptoKeys {
         let password_blob = {
             let mut params = k2v
                 .read_batch(&[k2v_read_single_key("keys", &password_sortkey)])
-                .await?;
+                .await
+                .context("ReadBatch to read password")?;
             if params.len() != 1 {
                 bail!(
                     "Invalid response from k2v storage: {:?} (expected one item)",
@@ -280,7 +283,8 @@ impl CryptoKeys {
             ct,
             &password_blob,
         )])
-        .await?;
+        .await
+        .context("InsertBatch for new password")?;
 
         Ok(())
     }
@@ -311,7 +315,8 @@ impl CryptoKeys {
         }
 
         k2v.delete_item("keys", &password_sortkey, pw.causality.clone())
-            .await?;
+            .await
+            .context("DeleteItem for password")?;
 
         Ok(())
     }
@@ -324,7 +329,8 @@ impl CryptoKeys {
                 k2v_read_single_key("keys", "salt"),
                 k2v_read_single_key("keys", "public"),
             ])
-            .await?;
+            .await
+            .context("ReadBatch for salt and public in check_uninitialized")?;
         if params.len() != 2 {
             bail!(
                 "Invalid response from k2v storage: {:?} (expected two items)",
@@ -344,7 +350,8 @@ impl CryptoKeys {
                 k2v_read_single_key("keys", "salt"),
                 k2v_read_single_key("keys", "public"),
             ])
-            .await?;
+            .await
+            .context("ReadBatch for salt and public in load_salt_and_public")?;
         if params.len() != 2 {
             bail!(
                 "Invalid response from k2v storage: {:?} (expected two items)",
@@ -399,7 +406,8 @@ impl CryptoKeys {
                 tombstones: false,
                 single_item: false,
             }])
-            .await?;
+            .await
+            .context("ReadBatch for prefix password: in list_existing_passwords")?;
         if res.len() != 1 {
             bail!("unexpected k2v result: {:?}, expected one item", res);
         }
@@ -443,7 +451,7 @@ pub fn argon2_kdf(salt: &[u8], password: &[u8], output_len: usize) -> Result<Vec
         .map_err(|e| anyhow!("Invalid argon2 params: {}", e))?;
     let argon2 = Argon2::new(Algorithm::default(), Version::default(), params);
 
-    let salt = base64::encode(salt);
+    let salt = base64::encode_config(salt, base64::STANDARD_NO_PAD);
     let hash = argon2
         .hash_password(password, &salt)
         .map_err(|e| anyhow!("Unable to hash: {}", e))?;
diff --git a/src/main.rs b/src/main.rs
index dcdd335..a2630d6 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -92,6 +92,11 @@ struct StorageCredsArgs {
 
 #[tokio::main]
 async fn main() -> Result<()> {
+    if std::env::var("RUST_LOG").is_err() {
+        std::env::set_var("RUST_LOG", "mailrage=info,k2v_client=info")
+    }
+    pretty_env_logger::init();
+
     let args = Args::parse();
 
     match args.command {