The Basics
- Nextcloud Server version (e.g., 29.x.x):
33.0.7
- Operating system and version (e.g., Ubuntu 24.04):
Ubuntu26.04
- Web server and version (e.g, Apache 2.4.25):
Apache/2.4.68
- Reverse proxy and version _(e.g. nginx 1.27.2)
Nginx 1.30.4
- PHP version (e.g, 8.3):
php/8.3.32
- Is this the first time you’ve seen this error? (Yes / No):
yes
- When did this problem seem to first start?
since I wanted to use backups
- Installation method (e.g. AlO, NCP, Bare Metal/Archive, etc.)
AIO
- Are you using CloudfIare, mod_security, or similar? (Yes / No)
no
Summary of the issue you are facing:
I wondered why my Nextcloud AIO instance would not update itself and according to this discussion the automatic updates are only scheduled when daily backups are configured. But so far I’ve been unable to enable those.
Steps to replicate it (hint: details matter!):
-
Open the AIO interface and set the “Local backup location” to
/mnt/backup. An encryption password is shown and I make a note of it. -
I click on “Create backup” and all containers (except
nextcloud-aio-mastercontainerof course) are shutdown. -
The backup fails. The log from https://localhost:8080/log?id=nextcloud-aio-borgbackup can be seen below.
Changing the location to a remote location (e.g. ssh://nextcloud@host/backup) does not work either and a similar message is being shown, see below.
Logging in to the nextcloud-aio-mastercontainer gives the following picture:
$ docker exec --user www-data -it nextcloud-aio-mastercontainer /bin/sh
~/docker-aio $ df -h /mnt/backup/
Filesystem Size Used Available Use% Mounted on
/dev/xvdb 19.9G 10.9G 9.0G 55% /mnt/backup
~/docker-aio $ ls -la /mnt/backup/
total 0
drwxr-xr-x 2 root root 6 Aug 5 20:08 .
drwxr-xr-x 1 root root 46 Aug 5 21:23 ..
When I manually start the nextcloud-aio-nextcloud container:
$ docker exec --user www-data -it nextcloud-aio-nextcloud /bin/sh
/var/www/html $ df -h /mnt/ncdata/
Filesystem Size Used Avail Use% Mounted on
nfs:/mnt/data/backup/nextcloud 3.7T 3.4T 314G 92% /mnt/ncdata
/var/www/html $ ls -la /mnt/ncdata/; cat /mnt/ncdata/.ncdata; echo
total 16
drwxr-x--- 8 www-data www-data 4096 Aug 16 15:25 .
drwxr-xr-x 1 root root 12 Aug 16 15:25 ..
-rw-r--r-- 1 www-data www-data 542 Aug 5 20:44 .htaccess
-rw-r--r-- 1 www-data www-data 52 Aug 5 20:44 .ncdata
dr-xr-x--- 2 1008 1008 37 Aug 5 20:32 .ssh
drwxr-xr-x 4 www-data www-data 44 Jan 24 2026 admin
drwxr-xr-x 14 www-data www-data 4096 Jan 27 2026 appdata_ocnv3rg8ar1o
-rw-r--r-- 1 www-data www-data 0 Jan 24 2026 audit.log
drwxr-x--- 2 www-data www-data 33 Aug 5 21:27 backup
-rw-r--r-- 1 www-data www-data 0 Aug 5 20:44 index.html
-rw-r--r-- 1 www-data www-data 0 Jan 24 2026 nextcloud.log
drwxr-xr-x 6 www-data www-data 96 May 24 11:02 xenon
# Nextcloud data directory
# Do not change this file
But of course when the nextcloud-aio-mastercontainer starts its backup, it also stops the nextcloud-aio-nextcloud – and then the datadir is not available anymore. I really don’t know if this a bug or if I’m just holding it wrong. I came across a post AIO backup .ocdata missing? from 2024 which referenced a bug NC30: backup failes · Issue #5256 · nextcloud/all-in-one · GitHub , but that one has been resolved a long time ago and should not matter here.
Does anyone have an idea what’s going on?
Log entries
Nextcloud
=== local backup
2026-08-16T15:45:06.318202683Z The .ncdata or .ocdata file is missing in Nextcloud datadir which means it is invalid!
2026-08-16T15:45:06.318267408Z Is the drive where the datadir is located on still mounted?
2026-08-16T15:45:07.285882371Z touch: /nextcloud_aio_volumes/nextcloud_aio_nextcloud_data/skip.update: Permission denied
2026-08-16T15:45:07.286399939Z chmod: /nextcloud_aio_volumes/nextcloud_aio_nextcloud_data/skip.update: Permission denied
=== remote backup
2026-08-16T15:50:49.513632332Z Your public ssh key for borgbackup is: xxx
2026-08-16T15:50:49.521608655Z The .ncdata or .ocdata file is missing in Nextcloud datadir which means it is invalid!
2026-08-16T15:50:49.521683643Z Is the drive where the datadir is located on still mounted?
2026-08-16T15:50:50.365055428Z touch: /nextcloud_aio_volumes/nextcloud_aio_nextcloud_data/skip.update: Permission denied
2026-08-16T15:50:50.367240304Z chmod: /nextcloud_aio_volumes/nextcloud_aio_nextcloud_data/skip.update: Permission denied
Configuration
Nextcloud
The output of occ config:list system:
{
"system": {
"one-click-instance": true,
"one-click-instance.user-limit": 100,
"memcache.local": "\\OC\\Memcache\\APCu",
"apps_paths": [
{
"path": "\/var\/www\/html\/apps",
"url": "\/apps",
"writable": false
},
{
"path": "\/var\/www\/html\/custom_apps",
"url": "\/custom_apps",
"writable": true
}
],
"check_data_directory_permissions": false,
"memcache.distributed": "\\OC\\Memcache\\Redis",
"memcache.locking": "\\OC\\Memcache\\Redis",
"redis": {
"host": "***REMOVED SENSITIVE VALUE***",
"password": "***REMOVED SENSITIVE VALUE***",
"port": 6379,
"timeout": 3,
"read_timeout": 10
},
"overwritehost": "cloud.example.net",
"overwriteprotocol": "https",
"passwordsalt": "***REMOVED SENSITIVE VALUE***",
"secret": "***REMOVED SENSITIVE VALUE***",
"trusted_domains": [
"localhost",
"cloud.example.net"
],
"datadirectory": "***REMOVED SENSITIVE VALUE***",
"dbtype": "pgsql",
"version": "33.0.7.1",
"overwrite.cli.url": "https:\/\/cloud.example.net\/",
"dbname": "***REMOVED SENSITIVE VALUE***",
"dbhost": "***REMOVED SENSITIVE VALUE***",
"dbtableprefix": "oc_",
"dbuser": "***REMOVED SENSITIVE VALUE***",
"dbpassword": "***REMOVED SENSITIVE VALUE***",
"installed": true,
"instanceid": "***REMOVED SENSITIVE VALUE***",
"maintenance": false,
"updatechecker": false,
"loglevel": 2,
"log_type": "file",
"logfile": "\/var\/www\/html\/data\/nextcloud.log",
"log_rotate_size": 10485760,
"log.condition": {
"apps": [
"admin_audit"
]
},
"preview_max_x": 2048,
"preview_max_y": 2048,
"jpeg_quality": 60,
"enabledPreviewProviders": {
"1": "OC\\Preview\\Image",
"2": "OC\\Preview\\MarkDown",
"3": "OC\\Preview\\MP3",
"4": "OC\\Preview\\TXT",
"5": "OC\\Preview\\OpenDocument",
"6": "OC\\Preview\\Movie",
"7": "OC\\Preview\\Krita",
"0": "OC\\Preview\\Imaginary",
"23": "OC\\Preview\\ImaginaryPDF",
"24": "OCA\\Eurooffice\\Preview"
},
"enable_previews": true,
"upgrade.disable-web": true,
"mail_smtpmode": "smtp",
"trashbin_retention_obligation": "auto, 30",
"versions_retention_obligation": "auto, 30",
"activity_expire_days": 30,
"simpleSignUpLink.shown": false,
"share_folder": "\/Shared",
"one-click-instance.link": "https:\/\/nextcloud.com\/all-in-one\/",
"upgrade.cli-upgrade-link": "https:\/\/github.com\/nextcloud\/all-in-one\/discussions\/2726",
"updatedirectory": "\/nc-updater",
"maintenance_window_start": 100,
"allow_local_remote_servers": true,
"davstorage.request_timeout": 3600,
"documentation_url.server_logs": "https:\/\/github.com\/nextcloud\/all-in-one\/discussions\/5425",
"htaccess.RewriteBase": "\/",
"dbpersistent": false,
"auth.bruteforce.protection.enabled": true,
"ratelimit.protection.enabled": true,
"files_external_allow_create_new_local": false,
"trusted_proxies": "***REMOVED SENSITIVE VALUE***",
"onlyoffice": {
"editors_check_interval": 0,
"jwt_secret": "***REMOVED SENSITIVE VALUE***",
"jwt_header": "AuthorizationJwt"
},
"preview_imaginary_url": "***REMOVED SENSITIVE VALUE***",
"preview_imaginary_key": "***REMOVED SENSITIVE VALUE***",
"mail_from_address": "***REMOVED SENSITIVE VALUE***",
"mail_sendmailmode": "smtp",
"mail_domain": "***REMOVED SENSITIVE VALUE***",
"mail_smtphost": "***REMOVED SENSITIVE VALUE***",
"mail_smtpport": "25",
"mail_smtpstreamoptions": {
"ssl": {
"allow_self_signed": true,
"verify_peer": false,
"verify_peer_name": false
}
},
"default_phone_region": "DE",
"twofactor_enforced": "true",
"twofactor_enforced_groups": [],
"twofactor_enforced_excluded_groups": [],
"memories.db.triggers.fcu": true,
"memories.exiftool": "\/var\/www\/html\/custom_apps\/memories\/bin-ext\/exiftool-amd64-musl",
"memories.vod.path": "\/var\/www\/html\/custom_apps\/memories\/bin-ext\/go-vod-amd64",
"memories.vod.ffmpeg": "\/usr\/bin\/ffmpeg",
"memories.vod.ffprobe": "\/usr\/bin\/ffprobe",
"serverid": 445,
"log_type_audit": "file",
"logfile_audit": "\/var\/www\/html\/data\/audit.log",
"update_channel": "stable",
"eurooffice": {
"editors_check_interval": 0,
"jwt_secret": "***REMOVED SENSITIVE VALUE***",
"jwt_header": "AuthorizationJwt"
},
"DOMAIN": "cloud.example.net",
"AIO_VERSION": "v13.4.1"
}
}
