diff --git a/docker.sh b/docker.sh
index e64fd1f..b303ff6 100755
--- a/docker.sh
+++ b/docker.sh
@@ -55,24 +55,17 @@ rm $cfg
 if [[ ! -z ${DRY_RUN:-} ]]; then
 	export APT_DRY_RUN=1
 fi
+
 base_url="https://apt.dockerproject.org/repo"
-remote_filelist="${APT_PATH}/filelist.remote"
-local_filelist="${APT_PATH}/filelist.local"
+remote_filelist="${APT_PATH}/filelist"
+[[ -f $remote_filelist ]] && rm $remote_filelist
 
 for version in ${APT_VERSIONS[@]}; do
 	apt-download-binary ${base_url} "$version" "main" "amd64" "${APT_PATH}" ${remote_filelist} || true
 	apt-download-binary ${base_url} "$version" "main" "i386" "${APT_PATH}"  ${remote_filelist} || true
 done
 
-APT_BACKUP_PATH="${BASE_PATH}/backup/apt"
-mkdir -p ${APT_BACKUP_PATH}
-(cd ${APT_PATH}; find . -type f -iname "*.deb") | sed 's+^\./++' > ${local_filelist}
-comm <(sort $remote_filelist) <(sort $local_filelist) -13 | while read file; do
-	echo "deleting ${file}"
-	mv "${APT_PATH}/$file" ${APT_BACKUP_PATH}
-done
-
-rm ${remote_filelist} ${local_filelist}
+apt-delete-old-debs ${APT_PATH} $remote_filelist
 
 # sync_docker "http://apt.dockerproject.org/" "${TUNASYNC_WORKING_DIR}/apt"
 # sync_docker "http://yum.dockerproject.org/" "${TUNASYNC_WORKING_DIR}/yum"
diff --git a/helpers/apt-download b/helpers/apt-download
index 2476722..2c58c1c 100644
--- a/helpers/apt-download
+++ b/helpers/apt-download
@@ -172,4 +172,20 @@ function apt-download-binary() {
 	return $ERROR
 }
 
+function apt-delete-old-debs {
+	local base_dir=$1
+	local remote_filelist=$2
+
+	[[ ! -d ${base_dir} ]] && return 1
+	[[ ! -f ${remote_filelist} ]] && return 1
+	
+	local_filelist="${base_dir}/filelist.local"
+	(cd ${base_dir}; find . -type f -iname "*.deb") | sed 's+^\./++' > ${local_filelist}
+	comm <(sort $remote_filelist) <(sort $local_filelist) -13 | while read file; do
+		echo "deleting ${file}"
+		rm ${file}
+	done
+	rm $local_filelist
+}
+
 # vim: ts=4 sts=4 sw=4
diff --git a/termux.sh b/termux.sh
index 1b25074..48d0b84 100755
--- a/termux.sh
+++ b/termux.sh
@@ -11,20 +11,14 @@ base_url=${TUNASYNC_UPSTREAM_URL:-"https://termux.net"}
 
 ARCHES=("aarch64" "all" "arm" "i686")
 
-remote_filelist="${BASE_PATH}/filelist.remote"
-local_filelist="${BASE_PATH}/filelist.local"
+remote_filelist="${BASE_PATH}/filelist"
+[[ -f $remote_filelist ]] && rm $remote_filelist
 
 for arch in ${ARCHES[@]}; do
 	echo "start syncing: ${arch}"
 	apt-download-binary "${base_url}" "stable" "main" "${arch}" "${BASE_PATH}" ${remote_filelist} || true
 done
 
-BACKUP_PATH="${BASE_PATH}/backup/"
-mkdir -p ${BACKUP_PATH}
-(cd ${BASE_PATH}; find . -type f -iname "*.deb") | sed 's+^\./++' > ${local_filelist}
-comm <(sort $remote_filelist) <(sort $local_filelist) -13 | while read file; do
-	echo "deleting ${file}"
-	mv "${BASE_PATH}/$file" ${BACKUP_PATH}
-done
+apt-delete-old-debs ${BASE_PATH} $remote_filelist
 
 echo "finished"