# \[calibre web\] backup core
**URL:** https://forum.yunohost.org/t/calibre-web-backup-core/37338
**Category:** Support apps
**Tags:** calibreweb, english
**Created:** [June 9, 2025, 8:12pm UTC](https://forum.yunohost.org/t/calibre-web-backup-core/37338 "2025-06-09T20:12:53Z")
**Posts on this page:** 6
**Page:** 1
### Author:  [@Maknho](https://forum.yunohost.org/u/Maknho)
#### Post date: [June 9, 2025, 8:12pm UTC](https://forum.yunohost.org/t/calibre-web-backup-core/37338/1 "2025-06-09T20:12:53Z")
**What type of hardware are you using** : Old laptop or computer
**What YunoHost version are you running** : 12.0.17
**What app is this about** : calibre web
### Describe your issue
backup impossible even with the last upgrade that should fix this issue
### Share relevant logs or error messages
/usr/share/yunohost/helpers.v2.1.d/backup: ligne 59: BACKUP\_CORE\_ONLY : variable sans liaison
Impossible de sauvegarder calibreweb
---
### Author:  [@otm33](https://forum.yunohost.org/u/otm33)
#### Post date: [June 9, 2025, 11:10pm UTC](https://forum.yunohost.org/t/calibre-web-backup-core/37338/2 "2025-06-09T23:10:10Z")
Hi,
This [thread](https://forum.yunohost.org/t/helpers-v2-1-backup-core-only-variable-sans-liaison/34138) may help
And did you try :
```auto
yunohost app setting calibreweb do_not_backup_data -v 1 (or 0 I guess ?)
```
or
`export BACKUP_CORE_ONLY=0`\* (or 1 accord to your needs) and then `yunohost backup create --apps calibreweb`
\*logout/login to reset environment when finished
---
### Author:  [@Krakinou](https://forum.yunohost.org/u/Krakinou)
#### Post date: [June 10, 2025, 3:22am UTC](https://forum.yunohost.org/t/calibre-web-backup-core/37338/3 "2025-06-10T03:22:00Z")
This is a yunohost core issue, have a look at this for a workaround:
> [@Helpers v2.1 : BACKUP\_CORE\_ONLY : variable sans liaison](https://forum.yunohost.org/t/helpers-v2-1-backup-core-only-variable-sans-liaison/34138):
>
> What type of hardware are you using: Raspberry Pi 3, 4+ What YunoHost version are you running: 12.0.9.1 How are you able to access your server: SSH Are you in a special context or did you perform specific tweaking on your YunoHost instance ?: No Describe your issue Hello, I updated simultaneously Nextcloud from 29.x to 30.0.4 and Yunohost from 12.0.something (don’t remember exactly) to 12.0.9.1 a few days ago, so I don’t exactly from where the issue is coming, but now everytime I try to bac…
This issue should be solved if your yunohost is up to date though : [Helpers v2.1 : BACKUP\_CORE\_ONLY is not bind · Issue #2512 · YunoHost/issues · GitHub](https://github.com/YunoHost/issues/issues/2512)
---
### Author:  [@Maknho](https://forum.yunohost.org/u/Maknho)
#### Post date: [June 10, 2025, 7:08am UTC](https://forum.yunohost.org/t/calibre-web-backup-core/37338/4 "2025-06-10T07:08:54Z")
hello @krakinou my yunohost is up to date (yuno : 12.0.17 and calibreweb **Version installée :** 0.96.24~ynh3) and i have the error above
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### Author:  [@Krakinou](https://forum.yunohost.org/u/Krakinou)
#### Post date: [June 10, 2025, 5:56pm UTC](https://forum.yunohost.org/t/calibre-web-backup-core/37338/5 "2025-06-10T17:56:58Z")
Strange, I also updated one on my instance to 12.0.17 and indeed, the error is not fixed. Maybe it will take some time before it reaches a productive version, idk. Maybe one of the core developer can explain?
In the meantime, the workaround from my previous post still stand.
---
### Author:  [@system](https://forum.yunohost.org/u/system)
#### Post date: [June 25, 2025, 5:57pm UTC](https://forum.yunohost.org/t/calibre-web-backup-core/37338/6 "2025-06-25T17:57:36Z")
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