diff --git a/README.md b/README.md
index 8648811..b067bcd 100644
--- a/README.md
+++ b/README.md
@@ -99,7 +99,6 @@ Recommended: Brotli/2-7
 
 ### Core functionality
 - Fix vacuum inconsistencies (either index related, or bundle syncing related)
-- Proper bundle usage analysis with compressed size estimation
 - Recompress & combine bundles
 - Allow to use tar files for backup and restore (--tar, http://alexcrichton.com/tar-rs/tar/index.html)
 - Allow to mount backups (inode id == position in index, lru cache)
diff --git a/src/cli/mod.rs b/src/cli/mod.rs
index 8fd1c83..1d423fb 100644
--- a/src/cli/mod.rs
+++ b/src/cli/mod.rs
@@ -41,7 +41,7 @@ fn get_backup(repo: &Repository, backup_name: &str) -> Backup {
     checked(repo.get_backup(backup_name), "load backup")
 }
 
-fn find_reference_backup(repo: &Repository, path: &str) -> Option<Backup> {
+fn find_reference_backup(repo: &Repository, path: &str) -> Option<(String, Backup)> {
     let mut matching = Vec::new();
     let hostname = match get_hostname() {
         Ok(hostname) => hostname,
@@ -58,12 +58,12 @@ fn find_reference_backup(repo: &Repository, path: &str) -> Option<Backup> {
             exit(3)
         }
     };
-    for (_name, backup) in backup_map {
+    for (name, backup) in backup_map {
         if backup.host == hostname && backup.path == path {
-            matching.push(backup);
+            matching.push((name, backup));
         }
     }
-    matching.sort_by_key(|b| b.date);
+    matching.sort_by_key(|&(_, ref b)| b.date);
     matching.pop()
 }
 
@@ -187,7 +187,7 @@ fn print_analysis(analysis: &HashMap<u32, BundleAnalysis>) {
     println!("Reclaimable space (depending on vacuum ratio)");
     #[allow(unknown_lints,needless_range_loop)]
     for i in 0..11 {
-        println!("  - ratio={:3}: {:10}, {:4.1} %", i*10, to_file_size(reclaim_space[i] as u64), reclaim_space[i] as f32 / data_total as f32 * 100.0);
+        println!("  - ratio={:3}: {:>10}, {:4.1} %", i*10, to_file_size(reclaim_space[i] as u64), reclaim_space[i] as f32 / data_total as f32 * 100.0);
     }
 }
 
@@ -222,16 +222,20 @@ pub fn run() {
             let mut repo = open_repository(&repo_path);
             let mut reference_backup = None;
             if !full {
-                reference_backup = reference.map(|r| get_backup(&repo, &r));
+                reference_backup = reference.map(|r| {
+                    let b = get_backup(&repo, &r);
+                    (r, b)
+                });
                 if reference_backup.is_none() {
                     reference_backup = find_reference_backup(&repo, &src_path);
                 }
-                if let Some(ref backup) = reference_backup {
-                    info!("Using backup from {} as reference", Local.timestamp(backup.date, 0).to_rfc2822());
+                if let Some(&(ref name, _)) = reference_backup.as_ref() {
+                    info!("Using backup {} as reference", name);
                 } else {
                     info!("No reference backup found, doing a full scan instead");
                 }
             }
+            let reference_backup = reference_backup.map(|(_, backup)| backup);
             if let Some(excludes_from) = excludes_from {
                 for line in BufReader::new(checked(File::open(excludes_from), "open excludes file")).lines() {
                     excludes.push(checked(line, "read excludes file"));
diff --git a/src/index.rs b/src/index.rs
index 2aa0bab..6f4db35 100644
--- a/src/index.rs
+++ b/src/index.rs
@@ -13,7 +13,7 @@ use mmap::{MemoryMap, MapOption, MapError};
 const MAGIC: [u8; 7] = *b"zvault\x02";
 const VERSION: u8 = 1;
 pub const MAX_USAGE: f64 = 0.9;
-pub const MIN_USAGE: f64 = 0.25;
+pub const MIN_USAGE: f64 = 0.35;
 pub const INITIAL_SIZE: usize = 1024;
 
 
diff --git a/src/repository/backup.rs b/src/repository/backup.rs
index 88105c6..02616ae 100644
--- a/src/repository/backup.rs
+++ b/src/repository/backup.rs
@@ -75,26 +75,24 @@ impl Repository {
                 backups.push((name, date, backup));
             }
         }
-        backups.sort_by_key(|backup| backup.2.date);
+        backups.sort_by_key(|backup| -backup.2.date);
         let mut keep = Bitmap::new(backups.len());
 
         fn mark_needed<K: Eq, F: Fn(&DateTime<Local>) -> K>(backups: &[(String, DateTime<Local>, Backup)], keep: &mut Bitmap, max: usize, keyfn: F) {
-            let mut unique = VecDeque::with_capacity(max+1);
+            let mut kept = 0;
             let mut last = None;
             for (i, backup) in backups.iter().enumerate() {
                 let val = keyfn(&backup.1);
                 let cur = Some(val);
                 if cur != last {
-                    last = cur;
-                    unique.push_back(i);
-                    if unique.len() > max {
-                        unique.pop_front();
+                    if kept >= max {
+                        break
                     }
+                    last = cur;
+                    keep.set(i);
+                    kept += 1;
                 }
             }
-            for i in unique {
-                keep.set(i);
-            }
         }
         if let Some(max) = yearly {
             mark_needed(&backups, &mut keep, max, |d| d.year());