I opened an issue in your Github regarding minor error the Bedrock-Server Docker. After thinking about it I thought it would make sense to write it here in the forum:
After looking through my logs I noticed that during the execution of the backups the script is not able to confirm the final command from the console: "save resume":
2022-02-08 17:24:52,102 DEBG 'backup-script' stdout output:
[info] Waiting for Minecraft console message 'Changes to the level are resumed', 5 retries left...
2022-02-08 17:25:02,109 DEBG 'backup-script' stdout output:
[info] Waiting for Minecraft console message 'Changes to the level are resumed', 4 retries left...
2022-02-08 17:25:12,115 DEBG 'backup-script' stdout output:
[info] Waiting for Minecraft console message 'Changes to the level are resumed', 3 retries left...
2022-02-08 17:25:22,122 DEBG 'backup-script' stdout output:
[info] Waiting for Minecraft console message 'Changes to the level are resumed', 2 retries left...
2022-02-08 17:25:32,129 DEBG 'backup-script' stdout output:
[info] Waiting for Minecraft console message 'Changes to the level are resumed', 1 retries left...
2022-02-08 17:25:42,135 DEBG 'backup-script' stdout output:
[warn] Minecraft console did not confirm message 'Changes to the level are resumed', giving up waiting...
[info] Minecraft worlds backup complete
Since the actual backup was successfull I ignored it for a while, but now after checking I found the issue:
The message that it is checking for "Changes to the level are resumed" has been changed with version 1.18.0.2 of BDS to "Changes to the world are resumed".