I've also had similar issues with backups the past few days.
2024-03-20T08:58:00.790Z box:shell backup-snapshot/app_c4a27e93-af6e-44e2-b7cf-9056fa01c5c3 code: null, signal: SIGKILL
2024-03-20T08:58:00.792Z box:taskworker Task took 10678.952 seconds
2024-03-20T08:58:00.793Z box:tasks setCompleted - 16169: {"result":null,"error":{"stack":"BoxError: Backuptask crashed\n at runBackupUpload (/home/yellowtent/box/src/backuptask.js:164:15)\n at process.processTicksAndRejections (node:internal/process/task_queues:95:5)\n at async uploadAppSnapshot (/home/yellowtent/box/src/backuptask.js:361:5)\n at async backupAppWithTag (/home/yellowtent/box/src/backuptask.js:383:5)\n at async fullBackup (/home/yellowtent/box/src/backuptask.js:504:29)","name":"BoxError","reason":"Internal Error","details":{},"message":"Backuptask crashed"}}
2024-03-20T08:58:00.793Z box:tasks update 16169: {"percent":100,"result":null,"error":{"stack":"BoxError: Backuptask crashed\n at runBackupUpload (/home/yellowtent/box/src/backuptask.js:164:15)\n at process.processTicksAndRejections (node:internal/process/task_queues:95:5)\n at async uploadAppSnapshot (/home/yellowtent/box/src/backuptask.js:361:5)\n at async backupAppWithTag (/home/yellowtent/box/src/backuptask.js:383:5)\n at async fullBackup (/home/yellowtent/box/src/backuptask.js:504:29)","name":"BoxError","reason":"Internal Error","details":{},"message":"Backuptask crashed"}}
BoxError: Backuptask crashed
It would be nice if the error or code it pointed too had more info about what happened. Best I can tell is it got killed somehow. I increased the backup task memory and will see what happens next time.
Edit: it didn't crash yesterday, so maybe it just needed more ram.