OK! So it just happened right now. As requested, here is the log file
Summary
[2021-07-30 18:54:37.599] [info] Backup started
[2021-07-30 18:54:37.603] [verbose] loadSettings
[2021-07-30 18:54:37.603] [verbose] loadBackupPath
[2021-07-30 18:54:37.618] [verbose] Plugin settings:
[2021-07-30 18:54:37.619] [verbose] path:
[2021-07-30 18:54:37.621] [verbose] singleJex: true
[2021-07-30 18:54:37.623] [verbose] backupRetention: 21
[2021-07-30 18:54:37.624] [verbose] backupInterval: 24
[2021-07-30 18:54:37.626] [verbose] onlyOnChange: false
[2021-07-30 18:54:37.630] [verbose] usePassword: false
[2021-07-30 18:54:37.634] [verbose] lastBackup: 1627555224593
[2021-07-30 18:54:37.638] [verbose] fileLogLevel: verbose
[2021-07-30 18:54:37.643] [verbose] zipArchive: no
[2021-07-30 18:54:37.645] [verbose] compressionLevel: 0
[2021-07-30 18:54:37.646] [verbose] exportPath:
[2021-07-30 18:54:37.649] [verbose] backupSetName: {YYYYMMDDHHmm}
[2021-07-30 18:54:37.651] [verbose] backupInfo: [{"name":"202107291610","date":1627555224593},{"name":"202107281606","date":1627468556846},{"name":"202107271605","date":1627382108438},{"name":"202107261602","date":1627295496463},{"name":"202107251601","date":1627209092679},{"name":"202107241558","date":1627122532297},{"name":"202107231554","date":1627035852624},{"name":"202107211111","date":1626846103748},{"name":"202107201111","date":1626759655756},{"name":"202107181758","date":1626611289997},{"name":"202107171754","date":1626524694373},{"name":"202107151211","date":1626331249508},{"name":"202107141024","date":1626238439726},{"name":"202107131021","date":1626151862363},{"name":"202107121018","date":1626065290066},{"name":"202107110927","date":1625975847517},{"name":"202107100920","date":1625889000000},{"name":"202107081903","date":1625751180000},{"name":"202107071737","date":1625659620000},{"name":"202107061736","date":1625573160000},{"name":"202107051716","date":1625485560000}]
[2021-07-30 18:54:37.651] [verbose] activeBackupPath: null
[2021-07-30 18:54:37.652] [verbose] backupBasePath: null
[2021-07-30 18:54:37.652] [verbose] logFile: C:\Users\xxxxxxxxxx\.config\joplin-desktop\cache\io.github.jackgruber.backup\activeBackup.log
[2021-07-30 18:54:37.652] [verbose] showDoneMsg: false
[2021-07-30 18:54:37.654] [verbose] installationDir: C:\Users\xxxxxxxxx\.config\joplin-desktop\cache\io.github.jackgruber.backup
[2021-07-30 18:54:37.655] [error] Please configure backup path in Joplin Tools > Options > Backup
Yesterday's backup worked ok.
This is the message that popped up when I started Joplin:
The backup plugin is v1.0.2
And this is what the settings page looks like:
I'm using Joplin 2.1.9 (prod, win32)
I honestly can't think of anything I have done that would cause this. The folder that backups are saved in hasn't changed on the drive. There are 21 folders with backups. It looks like the last time this happened was 7 days ago. Please let me know if you need more information.