Prune legacy zstd archive names

README.md

@@ -11,7 +11,8 @@ logic remains common and can be updated through Git.
 1. `stages/10-containers.sh` — stop, archive, pull, start and verify projects.
 2. `methods/20-rclone.sh` — copy archives to an rclone destination when enabled.
 3. `methods/30-smb.sh` — copy archives to a mounted SMB share when enabled.
-4. `stages/90-prune.sh` — retain the newest configured number locally.
+4. `stages/90-prune.sh` — retain the newest configured number of `.zst`
+   archives locally, including legacy `.zst` and current `.tar.zst` names.
 
 Every stage can also be run directly. The old `docker-backup.sh` name invokes
 the container archive stage, while `dockerbackup_prune.sh` invokes the local

stages/90-prune.sh

@@ -16,7 +16,8 @@ done
 require_positive_integer KEEP_COUNT "$KEEP_COUNT"
 [[ -d "$BACKUP_ROOT" ]] || { log SKIP "Backup root does not exist: $BACKUP_ROOT"; exit 0; }
 while IFS= read -r -d '' dir; do
-  mapfile -d '' -t files < <(find "$dir" -maxdepth 1 -type f -name '*.tar.zst' -printf '%T@ %p\0' | sort -z -nr | cut -z -d' ' -f2-)
+  # Match both current *.tar.zst archives and legacy *.zst archives.
+  mapfile -d '' -t files < <(find "$dir" -maxdepth 1 -type f -name '*.zst' -printf '%T@ %p\0' | sort -z -nr | cut -z -d' ' -f2-)
   (( ${#files[@]} > KEEP_COUNT )) || continue
   for file in "${files[@]:KEEP_COUNT}"; do
     if (( DRY_RUN )); then log WOULD "Remove $file"; else rm -f -- "$file"; log DELETE "Removed $file"; fi