feat(backup): add containerarchive-backed backup storage, restore, download, and pruning support

ts/classes/backup-scheduler.ts

@@ -59,6 +59,15 @@ export class BackupScheduler {
         await this.registerTask(schedule);
       }
 
+      // Add periodic archive prune task (runs daily at 3 AM)
+      const pruneTask = new plugins.taskbuffer.Task({
+        name: 'backup-archive-prune',
+        taskFunction: async () => {
+          await this.pruneArchive();
+        },
+      });
+      this.taskManager.addAndScheduleTask(pruneTask, '0 3 * * *');
+
       // Start the task manager (activates cron scheduling)
       await this.taskManager.start();
 
@@ -436,9 +445,11 @@ export class BackupScheduler {
       if (!toKeep.has(backup.id!)) {
         try {
           await this.oneboxRef.backupManager.deleteBackup(backup.id!);
-          logger.info(`Deleted backup ${backup.filename} (retention policy)`);
+          const backupRef = backup.snapshotId || backup.filename;
+          logger.info(`Deleted backup ${backupRef} (retention policy)`);
         } catch (error) {
-          logger.warn(`Failed to delete old backup ${backup.filename}: ${getErrorMessage(error)}`);
+          const backupRef = backup.snapshotId || backup.filename;
+          logger.warn(`Failed to delete old backup ${backupRef}: ${getErrorMessage(error)}`);
         }
       }
     }
@@ -647,4 +658,48 @@ export class BackupScheduler {
   private getRetentionDescription(retention: IRetentionPolicy): string {
     return `H:${retention.hourly} D:${retention.daily} W:${retention.weekly} M:${retention.monthly}`;
   }
+
+  /**
+   * Prune the containerarchive repository to reclaim storage.
+   * Uses the most generous retention policy across all schedules.
+   */
+  private async pruneArchive(): Promise<void> {
+    const archive = this.oneboxRef.backupManager.archive;
+    if (!archive) return;
+
+    try {
+      // Compute the most generous retention across all schedules
+      const schedules = this.oneboxRef.database.getAllBackupSchedules();
+
+      // Default minimums if no schedules exist
+      let maxDays = 7;
+      let maxWeeks = 4;
+      let maxMonths = 12;
+
+      for (const schedule of schedules) {
+        if (schedule.retention.daily > maxDays) maxDays = schedule.retention.daily;
+        if (schedule.retention.weekly > maxWeeks) maxWeeks = schedule.retention.weekly;
+        if (schedule.retention.monthly > maxMonths) maxMonths = schedule.retention.monthly;
+      }
+
+      const result = await archive.prune(
+        {
+          keepDays: maxDays,
+          keepWeeks: maxWeeks,
+          keepMonths: maxMonths,
+        },
+        false, // not dry run
+      );
+
+      if (result.removedSnapshots > 0 || result.freedBytes > 0) {
+        const freedMB = Math.round(result.freedBytes / (1024 * 1024) * 10) / 10;
+        logger.info(
+          `Archive prune: removed ${result.removedSnapshots} snapshot(s), ` +
+          `${result.removedPacks} pack(s), freed ${freedMB} MB`
+        );
+      }
+    } catch (error) {
+      logger.warn(`Archive prune failed: ${getErrorMessage(error)}`);
+    }
+  }
 }