diff --git a/backup.py b/backup.py
index 30c9e01..68257a0 100755
--- a/backup.py
+++ b/backup.py
@@ -17,7 +17,7 @@ def main():
     verify_running_as_root()
     local_pool = Pool(config.local_pool_to_backup)
     external_pool = ExternalPool.find_from_dict(config.backup_pools)
-    manager = Manager(local_pool, external_pool)
+    manager = Manager(local_pool, external_pool, config.recent_scrub_timedelta)
     manager.backup()
 
 
diff --git a/zfs_backup/commands/__init__.py b/zfs_backup/commands/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/zfs_backup/commands.py b/zfs_backup/commands/_core.py
similarity index 98%
rename from zfs_backup/commands.py
rename to zfs_backup/commands/_core.py
index cd734f3..4f80c68 100644
--- a/zfs_backup/commands.py
+++ b/zfs_backup/commands/_core.py
@@ -3,7 +3,7 @@ from __future__ import annotations
 from pathlib import Path
 from subprocess import Popen, call, check_output, PIPE
 
-from misc import assert_type
+from zfs_backup.misc import assert_type
 
 
 class CommandInterface:
diff --git a/zfs_backup/cryptsetup.py b/zfs_backup/commands/cryptsetup.py
similarity index 94%
rename from zfs_backup/cryptsetup.py
rename to zfs_backup/commands/cryptsetup.py
index 733074b..57ec893 100644
--- a/zfs_backup/cryptsetup.py
+++ b/zfs_backup/commands/cryptsetup.py
@@ -2,9 +2,9 @@ from __future__ import annotations
 
 from pathlib import Path
 
-from .messages import MAPPER_ENTRY_ALREADY_EXISTS, CANNOT_FIND_DEVICE_PATH
-from .commands import CommandInterface
-from .misc import DISK_BY_UUID, MAPPER_PATH
+from ._core import CommandInterface
+from ..messages import MAPPER_ENTRY_ALREADY_EXISTS, CANNOT_FIND_DEVICE_PATH
+from ..misc import MAPPER_PATH, DISK_BY_UUID
 
 
 class Cryptsetup(CommandInterface):
diff --git a/zfs_backup/zfs.py b/zfs_backup/commands/zfs.py
similarity index 92%
rename from zfs_backup/zfs.py
rename to zfs_backup/commands/zfs.py
index 528ab81..c99a599 100644
--- a/zfs_backup/zfs.py
+++ b/zfs_backup/commands/zfs.py
@@ -3,14 +3,13 @@ from __future__ import annotations
 from pathlib import Path
 from subprocess import Popen
 
-import config
-from .messages import DELETE_IN_LOCAL_POOL, SAME_DATASET
-from .misc import assert_type
-from .commands import CommandInterface
-from .snapshot import Snapshot
-from .dataset import Dataset
-from .pool import Pool
-from .zfs_path import ZFSPath
+from .. import Pool
+from ._core import CommandInterface
+from ..dataset import Dataset
+from ..messages import SAME_DATASET
+from ..misc import assert_type
+from ..snapshot import Snapshot
+from ..zfs_path import ZFSPath
 
 
 class ZFS(CommandInterface):
@@ -65,8 +64,6 @@ class ZFS(CommandInterface):
     def destroy_snapshot(cls, snapshot: Snapshot) -> None:
         """Non-recursively destroy a snapshot."""
         assert_type(snapshot, Snapshot, "Can only destroy snapshots.")
-        if config.local_pool_to_backup == snapshot.pool:
-            raise Exception(DELETE_IN_LOCAL_POOL)
         cls._run_command(*cls._Subcommands.destroy, str(snapshot))
 
     @classmethod
diff --git a/zfs_backup/zpool.py b/zfs_backup/commands/zpool.py
similarity index 81%
rename from zfs_backup/zpool.py
rename to zfs_backup/commands/zpool.py
index 45735e0..9bb1ba4 100644
--- a/zfs_backup/zpool.py
+++ b/zfs_backup/commands/zpool.py
@@ -1,12 +1,12 @@
 from __future__ import annotations
 
-from datetime import datetime, timedelta
+from datetime import timedelta, datetime
 from pathlib import Path
 
-from .misc import assert_type
-from .commands import CommandInterface
-from .pool import Pool
-from .time import Time
+from ._core import CommandInterface
+from ..pool import Pool
+from ..misc import assert_type
+from ..time import Time
 
 
 class ZPool(CommandInterface):
@@ -33,8 +33,9 @@ class ZPool(CommandInterface):
         assert_type(pool, Pool, "Can only export Pool objects")
         cls._run_command(*cls._Subcommands.export, pool.name)
 
+    @classmethod
     def scrub(
-        self,
+        cls,
         pool: Pool,
         *,
         skip_if_recently_scrubbed: bool,
@@ -45,16 +46,15 @@ class ZPool(CommandInterface):
 
         Waits for the scrub to finish. Raise an IOError if the pool reports as not healthy after the scrub."""
         assert_type(pool, Pool, "Can only scrub pools.")
-        self._scrub_if_necessary(
-            pool, skip_if_recently_scrubbed, recent_scrub_timedelta
-        )
+        cls._scrub_if_necessary(pool, skip_if_recently_scrubbed, recent_scrub_timedelta)
         if wait_for_finish:
-            self._run_command(*self._Subcommands.wait, pool.name)
-        if not self._is_healthy(pool):
+            cls._run_command(*cls._Subcommands.wait, pool.name)
+        if not cls._is_healthy(pool):
             raise IOError(f"Pool {pool.name} is not healthy.")
 
+    @classmethod
     def _scrub_if_necessary(
-        self,
+        cls,
         pool: Pool,
         skip_if_recently_scrubbed: bool,
         recent_scrub_timedelta: timedelta,
@@ -62,14 +62,14 @@ class ZPool(CommandInterface):
         """Scrub the pool. If"""
 
         def do_scrub():
-            self._run_command(*self._Subcommands.scrub, pool.name)
+            cls._run_command(*cls._Subcommands.scrub, pool.name)
 
-        if self._scrub_in_progress(pool):
+        if cls._scrub_in_progress(pool):
             return
         if not skip_if_recently_scrubbed:
             do_scrub()
         else:
-            if not self._recently_scrubbed(pool, recent_scrub_timedelta):
+            if not cls._recently_scrubbed(pool, recent_scrub_timedelta):
                 do_scrub()
 
     @classmethod
diff --git a/zfs_backup/core.py b/zfs_backup/core.py
index 48c72a8..299fe2f 100644
--- a/zfs_backup/core.py
+++ b/zfs_backup/core.py
@@ -1,18 +1,25 @@
 from __future__ import annotations
 
+from datetime import timedelta
 from subprocess import Popen
 
 import config
 from dataset import Dataset
 from pool import Pool, ExternalPool
 from snapshot import Snapshot
-from zfs import ZFS
+from zfs_backup.commands.zfs import ZFS
 
 
 class Manager:
     """Controls the overall backup process."""
 
-    def __init__(self, local_pool: Pool, external_pool: ExternalPool):
+    def __init__(
+        self,
+        local_pool: Pool,
+        external_pool: ExternalPool,
+        recent_scrub_timedelta: timedelta,
+    ):
+        self._recent_scrub_timedelta = recent_scrub_timedelta
         self._local_pool = local_pool
         self._external_pool = external_pool
 
@@ -20,10 +27,16 @@ class Manager:
         """Backup workflow."""
         self._external_pool.import_()
         try:
-            self._external_pool.scrub(skip_if_recently_scrubbed=True)
+            self._external_pool.scrub(
+                skip_if_recently_scrubbed=True,
+                recent_scrub_timedelta=self._recent_scrub_timedelta,
+            )
             self._backup_all_datasets()
             self._external_pool.clean_old_snapshots()
-            self._external_pool.scrub(skip_if_recently_scrubbed=False)
+            self._external_pool.scrub(
+                skip_if_recently_scrubbed=False,
+                recent_scrub_timedelta=self._recent_scrub_timedelta,
+            )
         finally:
             self._external_pool.export()
 
diff --git a/zfs_backup/dataset.py b/zfs_backup/dataset.py
index f4084b1..2b1c2a2 100644
--- a/zfs_backup/dataset.py
+++ b/zfs_backup/dataset.py
@@ -1,7 +1,7 @@
 from __future__ import annotations
 
 import config
-from zfs import ZFS
+from zfs_backup.commands.zfs import ZFS
 from zfs_backup.core import _get_regex_matching_snapshots_with_tags
 from snapshot import Snapshot
 from zfs_path import ZFSPath
diff --git a/zfs_backup/disk.py b/zfs_backup/disk.py
index 330a325..d235a2c 100644
--- a/zfs_backup/disk.py
+++ b/zfs_backup/disk.py
@@ -4,7 +4,7 @@ from pathlib import Path
 from uuid import UUID
 
 from .messages import ALREADY_DECRYPTED, NOT_DECRYPTED
-from .cryptsetup import Cryptsetup
+from .commands.cryptsetup import Cryptsetup
 from .misc import DISK_BY_UUID
 
 
diff --git a/zfs_backup/pool.py b/zfs_backup/pool.py
index fa787f4..b49cd24 100644
--- a/zfs_backup/pool.py
+++ b/zfs_backup/pool.py
@@ -1,14 +1,15 @@
 from __future__ import annotations
 
+from datetime import timedelta
 from uuid import UUID
 
 from .disk import Disk
 from .messages import CANNOT_FIND_BACKUP_DRIVE, ALREADY_IMPORTED, NOT_IMPORTED
 from .misc import MAPPER_PATH, DISK_BY_UUID
-from .zfs import ZFS
+from .commands.zfs import ZFS
 from .dataset import Dataset
 from .zfs_path import ZFSPath
-from .zpool import ZPool
+from .commands.zpool import ZPool
 
 
 class Pool:
@@ -52,9 +53,15 @@ class ExternalPool(Pool):
         self._imported = False
         print(f"Exported {self.name}. Disk {self._disk.uuid} can be removed.")
 
-    def scrub(self, skip_if_recently_scrubbed: bool) -> None:
+    def scrub(
+        self, skip_if_recently_scrubbed: bool, recent_scrub_timedelta: timedelta
+    ) -> None:
         print(f"Scrubbing {self._name}")
-        ZPool.scrub(self, skip_if_recently_scrubbed=skip_if_recently_scrubbed)
+        ZPool.scrub(
+            self,
+            skip_if_recently_scrubbed=skip_if_recently_scrubbed,
+            recent_scrub_timedelta=recent_scrub_timedelta,
+        )
 
     @classmethod
     def find_from_dict(cls, backup_pools: dict[str, UUID]) -> ExternalPool:
diff --git a/zfs_backup/snapshot.py b/zfs_backup/snapshot.py
index 797788e..8fafdf3 100644
--- a/zfs_backup/snapshot.py
+++ b/zfs_backup/snapshot.py
@@ -3,7 +3,7 @@ from __future__ import annotations
 from re import search
 
 from dataset import Dataset
-from zfs import ZFS
+from zfs_backup.commands.zfs import ZFS
 from zfs_path import ZFSPath