@peder Did you resolve this issue or report it on github (can't find it)? I have same issue reattaching NFS and iSCSI SR. After clicking reattach button, the SR is created but with no PBD. Creating new SR is fine. I have to use xencenter for reattaching.

@julien-f Backup files check found no problems, so I tried to restore again and it works. No changes or updates in XO, no changes on vhd or json files (same dates and sizes). Only think I did was detach and attach backup repository (settings - remotes) which I tried before with no luck.

Trying to restore delta backup in Orchestra v5.70.0 build from sources.

Oldest backup
November 8, 2020, 11:20:01 PM

Latest backup
November 23, 2020, 11:20:01 PM

Available Backups
delta 18

Web UI throws error:

ENOENT: no such file or directory, open '/run/xo-server/mounts/26a365a5-fff3-4ad9-b9af-f041f04ed42b/xo-vm-backups/b487c411-18b8-1de3-55d3-9ac6480d4732/vdis/638f3d43-3ed8-4906-a78f-b98184681a0e/6f9e79f0-fbc7-4045-acca-44cebbe1c7b4/20201106T222001Z.vhd'

On Orchestra VM:

root@xoa:~# ls /run/xo-server/mounts/26c5174a-1dda-4d2a-a627-543b0d8aeb4b/xo-vm-backups/b487c411-18b8-1de3-55d3-9ac6480d4732/vdis/638f3d43-3ed8-4906-a78f-b98184681a0e/6f9e79f0-fbc7-4045-acca-44cebbe1c7b4 -l -h
total 408G
-rw-r--r-- 1 root root  20G Nov 24 01:23 20201108T222001Z.vhd
-rw-r--r-- 1 root root  31G Nov  9 23:29 20201109T222001Z.vhd
-rw-r--r-- 1 root root  34G Nov 10 23:30 20201110T222001Z.vhd
-rw-r--r-- 1 root root  43G Nov 11 23:32 20201111T222001Z.vhd
-rw-r--r-- 1 root root  34G Nov 12 23:30 20201112T222001Z.vhd
-rw-r--r-- 1 root root  35G Nov 13 23:30 20201113T222001Z.vhd
-rw-r--r-- 1 root root  16G Nov 14 23:24 20201114T222001Z.vhd
-rw-r--r-- 1 root root  15G Nov 15 23:24 20201115T222001Z.vhd
-rw-r--r-- 1 root root  30G Nov 16 23:28 20201116T222001Z.vhd
-rw-r--r-- 1 root root  14G Nov 17 23:23 20201117T222001Z.vhd
-rw-r--r-- 1 root root  36G Nov 18 23:30 20201118T222001Z.vhd
-rw-r--r-- 1 root root  34G Nov 19 23:30 20201119T222001Z.vhd
-rw-r--r-- 1 root root  36G Nov 20 23:33 20201120T222001Z.vhd
-rw-r--r-- 1 root root  12G Nov 21 23:23 20201121T222001Z.vhd
-rw-r--r-- 1 root root  12G Nov 22 23:24 20201122T222001Z.vhd
-rw-r--r-- 1 root root  12G Nov 23 12:21 20201123T111720Z.vhd
-rw-r--r-- 1 root root 603K Nov 23 12:38 20201123T113818Z.vhd

File is really missing. I was not messing with .vhd files on filesystem (actually this is the first time I saw where they are). Just remember lowering retention policy (through web UI) couple days ago if it's relative.