Error in syslog when backing up - No such file or directory (os error 2)

[Addspin]

Hi, I have this error, I have seen many repeated, but it is not quite clear how it was solved.

Text error:

proxmox-backup-proxy[12393]: error during snapshot file listing: 'unable to load blob '"/pbs_data/host/pbs01/2021-05-07T09:04:13Z/index.json.blob"' - No such file or directory (os error 2)'

The backup comes from a mounted NFS share.
The backup eventually runs, seems to be successful, there are no errors, except for these messages in the syslog, they may be repeated several times during the backup run.

Packages versions:

proxmox-backup: 1.0-4 (running kernel: 5.4.101-1-pve)
proxmox-backup-server: 1.1.5-1 (running version: 1.1.5)
pve-kernel-5.4: 6.4-1
pve-kernel-helper: 6.4-1
pve-kernel-5.4.106-1-pve: 5.4.106-1
pve-kernel-5.4.101-1-pve: 5.4.101-1
pve-kernel-5.4.65-1-pve: 5.4.65-1
ifupdown2: 3.0.0-1+pve3
libjs-extjs: 6.0.1-10
proxmox-backup-docs: 1.1.5-1
proxmox-backup-client: 1.1.5-1
proxmox-mini-journalreader: 1.1-1
proxmox-widget-toolkit: 2.5-2
pve-xtermjs: 4.7.0-3
smartmontools: 7.2-pve2
zfsutils-linux: 2.0.4-pve1

 

[dcsapak]

this may happen if some snapshots vanish during the snapshot file listing (e.g. because of pruning)

 

[Addspin]

What if it happens when a resource is backed up for the first time? And there is definitely nothing else running at that time.

 

[dcsapak]

What if it happens when a resource is backed up for the first time

what exactly do you mean?

the error simply states that while it tried to list the snapshots, it could not find '/pbs_data/host/pbs01/2021-05-07T09:04:13Z/index.json.blob'
does that snapshot exists?