Cannot create snapshot on a Ubuntu Client

client
1

Hello,

i become on a Ubuntu Client with btrfs Errors like Cannot create snapshot of file system with type cifs Creating snapshot of "/data/SMB/NAS/Public" failed Creating snapshot of "/snap/firefox/8054/data-dir/themes" failed Creating snapshot of "/snap/thunderbird/1057/data-dir/themes" failed

But i exclude the SMB Path with /data/NFS;/data/SMB;/data/SMB/NAS

Whats must more exclude to prevent this Errors?
But, Firefox, Thunderbird was nice to include/backup.

Many Thanks!

Many Greetings

Revan335

2

answer from AI:

These errors occur because UrBackup attempts to back up paths where taking a snapshot is technically impossible, such as “snap” (virtual file systems) and “SMB/CIFS” (network shares).

The BTRFS snapshot mechanism works only on local disk partitions; it cannot take a snapshot of a network share or a read-only virtual snap package.

To completely eliminate these errors, you need to add the following paths to the “Excluded files (with wildcards)” section:

1. Exclusion Paths to Add (Exclusion List)

Paste the following into the exclusion list in UrBackup settings:

Plaintext

/snap/*;/data/SMB/*;/data/NFS/*;/run/user/*;/sys/*;/proc/*;/dev/*

2. Specific Causes of Errors and Solutions

Snap Packages (/snap/…): Applications like Firefox and Thunderbird are installed as “Snaps” in Ubuntu. These are actually compressed, read-only file systems that the system “mounts” under /snap. Snapshots cannot be taken of these, and they do not need to be backed up (since the application can be uninstalled and reinstalled).

Solution: Be sure to exclude the /snap/* path.

Network Shares (CIFS/SMB/NFS): The error you encountered at the /data/SMB/NAS/Public path is caused by UrBackup failing to recognize that this directory is a “mount point.” Even if you exclude the root directory, UrBackup may trigger a snapshot while attempting to access subdirectories.

Solution: Use the /* wildcard to completely exclude the entire contents, not just the root directory.

Virtual File Systems: Adding temporary session files like /run/user/* to the list will reduce the number of errors.

3. Important Setting Check

Check the status of the following option in UrBackup Client settings:

“Backup backups across different file systems”: If this is checked, UrBackup will attempt to scan everything from a disk to network shares (SMB).

Recommendation: Leave this unchecked. This way, UrBackup automatically skips mounted remote disks or snap partitions.

4. Why Is It Still Giving Errors? (Wildcard Tip)

You’ve excluded the /data/SMB path, but the error is coming from /data/SMB/NAS/Public. UrBackup sometimes expects an exact path match. Therefore, using this format is more reliable:

*/data/SMB/*

Summary List:

To eliminate errors completely, set the “Excluded files” section to the following:

*/snap/*;*CIFS*;*/data/SMB/*;*/data/NFS/*;*/data/SMB/NAS/*

3

How can i find this? I don’t see that on the Client or Server Side.

4

You may not find this in the web interface in the new version. Therefore, please connect to the client via SSH and check the following setting:

File Path: /usr/local/var/urbackup/data/settings.cfg (or /var/urbackup/data/settings.cfg, depending on your installation)

Parameter to Change: backup_across_mountpoints

Edit the file as follows:

sudo nano /etc/default/urbackupclient # This is where it is located in some distributions

# Or check the main configuration file:

sudo grep -r “backup_across_mountpoints” /usr/local/var/urbackup/

Set this value to false or 0 (disabled).

5

Thats look than this Option was in older Version available? Come this back in the next Version on x Month x?

6

I’ve never used the previous versions. I’m currently using version 2.5.37. I can’t say whether this feature was available in earlier versions or if it will appear in future versions. I think the developers might be able to answer that question.