Used storage unknown, statistics empty

Server
1

Hi there, I’ve recently set up a server and two clients. Backups work fine, but

  • Activities → Last activities, Used Storage is still Unknown for all file backups (full and incremental)
  • Backups → client → File backups, Size is -1
  • Statistics is empty

As I understand, the server deletes old backups and updates statistics during the Cleanup time window, 3 to 4am every night by default. And my server runs at night, it doesn’t turn off or go to sleep.

Here’s what happened when I tried to recalculate statistics (button on Statistics page):

On the first click it updates immediately, nothing in Activities, and it does fill Statistics page, but the numbers are too low - e.g. it reports 3.93 GB sum usage for one of the clients - less than a single full backup (4.29 GB). Also

  • Activities → Last activities, Used Storage is still Unknown
  • Backups → client → File backups, Size is still -1

Here’s what the logs show:

2025-11-18 12:35:32: HTTP: No available slots... starting new Worker
2025-11-18 12:35:32: Sending file "urbackup\\www/images/indicator.gif"
2025-11-18 12:35:32: Sending file: urbackup\\www/images/indicator.gif
2025-11-18 12:35:32: Sending file: urbackup\\www/images/indicator.gif done
2025-11-18 12:35:39: 1000 entries processed
2025-11-18 12:35:39: 2000 entries processed
2025-11-18 12:35:39: 3000 entries processed
2025-11-18 12:35:39: 3983 entries processed. Resetting and updating statistics.
2025-11-18 12:35:39: Statistics recalculation done

On the second click, in Activities, it shows Recalculating statistics, with Progress “Indexing…”, showing repeated “Waiting for statistics update to finish…” in logs for hours, with no cpu or disk activity, until I restart the service.

Any idea what’s going on?

UrBackup Server 2.5.34 Rev. 65c5000eb3
Windows 11 IoT Enterprise LTSC 24H2 26100.7171

2

The difference between full and the report implies space savings. Urbackup’s incremental backups only store the difference between full and now. All the stuff that’s the same is “space saved” via links or (depending on urbackup storage filesystem) copy on write.

I am unclear on types of backups that have occurred in which clients. How many full backups min and max did you specify? File and image? Over what time period?

If your server sleeps at night (possibly) then how do you expect it to do the cleanup? The cleanup time is configurable in the web UI.

3

I understand how incremental backups work, that’s not the problem. The problem is that the reported (in statistics) sum of all client’s backups is less than a single full backup size. Plus, Unknown or -1 byte backup size for all clients.

File backups only, min/max is irrelevant since the server is 2 days old. So far there are 1 full backup plus a few differential ones for each client. The space reported is Unknown or -1 byte is for all clients.

As I said, server is up at night. Also, I think the docs mentioned that if server misses the cleanup window, it will do the cleanup asap the next time it’s up.

4

Solved both problems (wrong stats and unknown or -1 byte backup sizes) by running “C:\Program Files\UrBackupServer\cleanup.bat” script with “0%” argument. Closing the topic; if cleanup won’t run automatically again, I’ll create a new one.