Upload error: signal killed at end of maintenance

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Hello,

I am running kopia 0.15.0 installed from the official apt mirror (packages.kopia.io) on my Debian Stable server. Since some time, I get failure messages at the end of the backup. Below is a log from a run from a systemd unit: /usr/bin/kopia --log-level=debug snapshot create --all. A manual run shows the same behavior.

The snapshots are all there and as the log shows it is at the end of the maintenance stage. The storage backend is sftp (Hetzner StorageBox).

Do you have any ideas what can be the problem here?

Thanks!

[...]
Dec 28 00:34:32 asaru kopia[2252254]: Skipping blob deletion because not enough time has passed yet (59m59s left).
Dec 28 00:34:32 asaru kopia[2252254]: DEBUG Extending object lock retention-period is disabled.
Dec 28 00:34:32 asaru kopia[2252254]: DEBUG [STORAGE] ListBlobs {"prefix":"_","resultCount":34,"error":null,"duration":"113.019257ms"}
Dec 28 00:34:32 asaru kopia[2252254]: DEBUG Keeping 33 logs of total size 30.6 MB
Dec 28 00:34:32 asaru kopia[2252254]: DEBUG [STORAGE] DeleteBlob        {"blobID":"_log_20231128000003_714f_1701126003_1701127936_1_a1f556fe960559c7b0195090a369bf08","error":null,"duration":"3.058195ms"}
Dec 28 00:34:32 asaru kopia[2252254]: Cleaned up 1 logs.
Dec 28 00:34:32 asaru kopia[2252254]: DEBUG [STORAGE] PutBlob   {"blobID":"kopia.maintenance","length":3500,"error":null,"duration":"12.232187ms"}
Dec 28 00:34:32 asaru kopia[2252254]: Cleaning up old index blobs which have already been compacted...
Dec 28 00:34:34 asaru kopia[2252254]: DEBUG [STORAGE] ListBlobs {"prefix":"xn","resultCount":38,"error":null,"duration":"2.480532213s"}
Dec 28 00:34:34 asaru kopia[2252254]: DEBUG [STORAGE] PutBlob   {"blobID":"kopia.maintenance","length":3501,"error":null,"duration":"13.122312ms"}
Dec 28 00:34:34 asaru kopia[2252254]: Finished full maintenance.
Dec 28 00:34:34 asaru kopia[2252254]: DEBUG [STORAGE] PutBlob   {"blobID":"_log_20231228000003_88e4_1703718005_1703720074_1_2a92fc03eff66b71c833eacdb36734c0","length":1182023,"error":null,"duration":"22.766481ms"}
Dec 28 00:34:34 asaru kopia[2252254]: DEBUG closing active connection.
Dec 28 00:34:34 asaru kopia[2252254]: DEBUG [STORAGE] Close     {"error":null,"duration":"5.05834ms"}
Dec 28 00:34:34 asaru kopia[2252254]: ERROR upload error: signal: killed
Dec 28 00:34:35 asaru systemd[1]: kopia.service: Main process exited, code=exited, status=1/FAILURE
Dec 28 00:34:35 asaru systemd[1]: kopia.service: Failed with result 'exit-code'.
Dec 28 00:34:35 asaru systemd[1]: Failed to start kopia backup.