Use globs, set nullglob, and remove stdout redirection for import

plugins/config/backup-export

@@ -1,6 +1,7 @@
 #!/usr/bin/env bash
 set -eo pipefail; [[ $DOKKU_TRACE ]] && set -x
+shopt -s nullglob
 VERSION="$1"
 BASE_DIR="$2"
 
-cat; find $BASE_DIR -regex ".*/ENV"
+cat; for i in $BASE_DIR/*/ENV; do echo $i; done

plugins/config/backup-import

@@ -1,10 +1,11 @@
 #!/usr/bin/env bash
 set -eo pipefail; [[ $DOKKU_TRACE ]] && set -x
+shopt -s nullglob
 VERSION="$1"
 IMPORT_DIR="$2"
 TARGET_DIR="$3"
 
 cd $IMPORT_DIR
-for file in `find . -regex ".*/ENV"`; do
+for file in */ENV; do
     cp $file "$TARGET_DIR/$file"
 done