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Solved

the backup file is not being created

Firefox 備份資料
TechHorse replied
avtxr
avtxr

helloooo

i am experiencing an issue with firefox where backup (Firefox Backup) is not working since version 148.0

problem: - when I try to create a backup, i get the error: “Hmm, there was a problem with the backup. Please try again in a few minutes.”

what I have already tried: - enabled and disabled backup password - changed the backup folder/location - cleared browser cache - tested across multiple updates (issue persists)

- backup is enabled, but I cannot create one - the error occurs every time - restarting the browser and system did not help

helloooo i am experiencing an issue with firefox where backup (Firefox Backup) is not working since version 148.0 problem: - when I try to create a backup, i get the error: “Hmm, there was a problem with the backup. Please try again in a few minutes.” what I have already tried: - enabled and disabled backup password - changed the backup folder/location - cleared browser cache - tested across multiple updates (issue persists) - backup is enabled, but I cannot create one - the error occurs every time - restarting the browser and system did not help
附加的畫面擷圖
avtxr
avtxr 提出問題者
從原來的回覆中察看解決方案

選擇的解決方法

after deleting the files from the "snapshots" folder, the backup went without error. but when I started the backup again, i got the error again, then i just deleted the "backups" folder – now everything works.

but its strange that such characters appear – apparently there's a problem with cyrillic.

所有回覆 (10)

hsohaney
hsohaney Mozilla 員工

Hey! So sorry to hear about this :( Could you go to about:config and then search up the preference browser.backup.backup-debug-info and share what it's set to?

avtxr
avtxr 提出問題者

{"lastBackupAttempt":1777034400,"errorCode":{"name":"BackupError","stack":"#prepareStagingFolder@resource:///modules/backup/BackupService.sys.mjs:1976:25\n","unremovableContents":["C:\\Users\\User\\AppData\\Roaming\\Mozilla\\Firefox\\Profiles\\4yhq4lxf.default-1533239578278\\backups\\snapshots\\2026-03-26T10-15-28Z.zip","C:\\Users\\User\\AppData\\Roaming\\Mozilla\\Firefox\\Profiles\\4yhq4lxf.default-1533239578278\\backups\\snapshots\\archive.html","C:\\Users\\User\\AppData\\Roaming\\Mozilla\\Firefox\\Profiles\\4yhq4lxf.default-1533239578278\\backups\\snapshots\\staging-0","C:\\Users\\User\\AppData\\Roaming\\Mozilla\\Firefox\\Profiles\\4yhq4lxf.default-1533239578278\\backups\\snapshots\\staging-1","C:\\Users\\User\\AppData\\Roaming\\Mozilla\\Firefox\\Profiles\\4yhq4lxf.default-1533239578278\\backups\\snapshots\\staging-2","C:\\Users\\User\\AppData\\Roaming\\Mozilla\\Firefox\\Profiles\\4yhq4lxf.default-1533239578278\\backups\\snapshots\\staging-3"]},"lastRunStep":5}

cor-el
cor-el
  • 版主

Looks like a problem with #prepareStagingFolder

Are there messages in the Browser Console related to the backup?

Decoded: 

 lastBackupAttempt:1777034400; (2026-04-24T12:40:00.000Z)
 errorCode:
  name:BackupError;
  stack:#prepareStagingFolder@resource:///modules/backup/BackupService.sys.mjs:1976:25\n;
  unremovableContents:
   0:C:\Users\User\AppData\Roaming\Mozilla\Firefox\Profiles\4yhq4lxf.default-1533239578278\backups\snapshots\2026-03-26T10-15-28Z.zip;
   1:C:\Users\User\AppData\Roaming\Mozilla\Firefox\Profiles\4yhq4lxf.default-1533239578278\backups\snapshots\archive.html;
   2:C:\Users\User\AppData\Roaming\Mozilla\Firefox\Profiles\4yhq4lxf.default-1533239578278\backups\snapshots\staging-0;
   3:C:\Users\User\AppData\Roaming\Mozilla\Firefox\Profiles\4yhq4lxf.default-1533239578278\backups\snapshots\staging-1;
   4:C:\Users\User\AppData\Roaming\Mozilla\Firefox\Profiles\4yhq4lxf.default-1533239578278\backups\snapshots\staging-2;
   5:C:\Users\User\AppData\Roaming\Mozilla\Firefox\Profiles\4yhq4lxf.default-1533239578278\backups\snapshots\staging-3;
 lastRunStep:5;

cor-el
cor-el
  • 版主

Maybe check the write permissions of the snapshots folder with the path in the screenshot as Firefox isn't able to remove previously saved snapshots.

cor-el
cor-el
  • 版主

It could also be possible that your security software keeps an handle on files.

Reboot the computer into Windows Safe Mode with network support to see if that has effect.

avtxr
avtxr 提出問題者

maybe just delete these files?

my antivirus is always turned off, except in a few cases.

Denys
Denys
  • 版主
  • 前 10 名貢獻者

There's also a message (the first one) that Firefox can't write to "C:\Users\User\Documents\Restore Firefox", which would be critical for creating a backup. So, while you can remove the mentioned folders/files manually, that alone may not be enough to fix this.

avtxr
avtxr 提出問題者

選擇的解決方法

after deleting the files from the "snapshots" folder, the backup went without error. but when I started the backup again, i got the error again, then i just deleted the "backups" folder – now everything works.

but its strange that such characters appear – apparently there's a problem with cyrillic.

TechHorse
TechHorse

The release notes for the latest Firefox version, 150.0.2, say "Fixed an issue that could prevent Firefox’s local backup feature from completing successfully", if this is related.

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