Estimation has been interrupted

Support
1

I have setup a daily backup starting at 3:30 of about 1.7 TB source producing about 1.9TB backup since a couple of years on an external 4TB USB disk.
Apparently it works very well, the daily check has never found any missing file, and when I had to recover any lost file I have always been able to find it. Howerver very often in the log file I find this situation:

…
| 03:49:41.558 snapshotted directory {"path":"MyAlbum","dur":"2m27.1946951s","size":641679212968,"files":113654,"dirs":2274,"errors":0} |
| 03:49:41.559 snapshotted directory {"path":".","dur":"19m35.5611618s","size":1667152840498,"files":839547,"dirs":48958,"errors":0} |
| 03:49:41.559 Estimation has been interrupted |
| 03:49:41.562 keeping 2025-02-28 23:30:00.0260881 +0100 CET retention: [monthly-20] pins: [] |
…
03:49:41.562 created snapshot 4754998f196770d25770e9b1035240df

What does it mean “Estimation has been interrupted”? Is still there some kind of timeout that stops the process after a few hours? I can’t remember of setting it up, but after a couple of years I am not sure.

Thank you in advance

2

Looks like the error comes from this PR:

Kopia estimates the backup size before snapshotting to show accurate progress information. For large snapshots this can take a lot of time, so Kopia stops iterating over all files and uses a different method for rough estimation.

Conclusion: Nothing to worry about.