diff --git a/src/api2/backup/environment.rs b/src/api2/backup/environment.rs
index d515bf30..b035f1e2 100644
--- a/src/api2/backup/environment.rs
+++ b/src/api2/backup/environment.rs
@@ -9,7 +9,7 @@ use proxmox::tools::digest_to_hex;
 use proxmox::tools::fs::{replace_file, CreateOptions};
 use proxmox::api::{RpcEnvironment, RpcEnvironmentType};
 
-use crate::api2::types::{Userid, SnapshotVerifyState, VerifyState};
+use crate::api2::types::Userid;
 use crate::backup::*;
 use crate::server::WorkerTask;
 use crate::server::formatter::*;
@@ -66,8 +66,8 @@ struct FixedWriterState {
     incremental: bool,
 }
 
-// key=digest, value=(length, existance checked)
-type KnownChunksMap = HashMap<[u8;32], (u32, bool)>;
+// key=digest, value=length
+type KnownChunksMap = HashMap<[u8;32], u32>;
 
 struct SharedBackupState {
     finished: bool,
@@ -156,7 +156,7 @@ impl BackupEnvironment {
 
         state.ensure_unfinished()?;
 
-        state.known_chunks.insert(digest, (length, false));
+        state.known_chunks.insert(digest, length);
 
         Ok(())
     }
@@ -198,7 +198,7 @@ impl BackupEnvironment {
         if is_duplicate { data.upload_stat.duplicates += 1; }
 
         // register chunk
-        state.known_chunks.insert(digest, (size, true));
+        state.known_chunks.insert(digest, size);
 
         Ok(())
     }
@@ -231,7 +231,7 @@ impl BackupEnvironment {
         if is_duplicate { data.upload_stat.duplicates += 1; }
 
         // register chunk
-        state.known_chunks.insert(digest, (size, true));
+        state.known_chunks.insert(digest, size);
 
         Ok(())
     }
@@ -240,7 +240,7 @@ impl BackupEnvironment {
         let state = self.state.lock().unwrap();
 
         match state.known_chunks.get(digest) {
-            Some((len, _)) => Some(*len),
+            Some(len) => Some(*len),
             None => None,
         }
     }
@@ -457,47 +457,6 @@ impl BackupEnvironment {
         Ok(())
     }
 
-    /// Ensure all chunks referenced in this backup actually exist.
-    /// Only call *after* all writers have been closed, to avoid race with GC.
-    /// In case of error, mark the previous backup as 'verify failed'.
-    fn verify_chunk_existance(&self, known_chunks: &KnownChunksMap) -> Result<(), Error> {
-        for (digest, (_, checked)) in known_chunks.iter() {
-            if !checked && !self.datastore.chunk_path(digest).0.exists() {
-                let mark_msg = if let Some(ref last_backup) = self.last_backup {
-                    let last_dir = &last_backup.backup_dir;
-                    let verify_state = SnapshotVerifyState {
-                        state: VerifyState::Failed,
-                        upid: self.worker.upid().clone(),
-                    };
-
-                    let res = proxmox::try_block!{
-                        let (mut manifest, _) = self.datastore.load_manifest(last_dir)?;
-                        manifest.unprotected["verify_state"] = serde_json::to_value(verify_state)?;
-                        self.datastore.store_manifest(last_dir, serde_json::to_value(manifest)?)
-                    };
-
-                    if let Err(err) = res {
-                        format!("tried marking previous snapshot as bad, \
-                                but got error accessing manifest: {}", err)
-                    } else {
-                        "marked previous snapshot as bad, please use \
-                        'verify' for a detailed check".to_owned()
-                    }
-                } else {
-                    "internal error: no base backup registered to mark invalid".to_owned()
-                };
-
-                bail!(
-                    "chunk '{}' was attempted to be reused but doesn't exist - {}",
-                    digest_to_hex(digest),
-                    mark_msg
-                );
-            }
-        }
-
-        Ok(())
-    }
-
     /// Mark backup as finished
     pub fn finish_backup(&self) -> Result<(), Error> {
         let mut state = self.state.lock().unwrap();
@@ -534,8 +493,6 @@ impl BackupEnvironment {
             }
         }
 
-        self.verify_chunk_existance(&state.known_chunks)?;
-
         // marks the backup as successful
         state.finished = true;