@d19dotca said in Backup to ext4 disk mount, using rsync, fails on first full backup but succeeds in all future ones.:
Setup a new public cloud instance at OVH
Create a block storage disk and attach it to the public instance created in step 1
Format the block storage disk and mount it according to this article: https://docs.ovh.com/ca/en/public-cloud/create_and_configure_an_additional_disk_on_an_instance/#using-linux
Install and restore Cloudron from old server via DigitalOcean Spaces latest Cloudron backup ID
Once Cloudron is running off latest backup, change backup configuration to file system using rsync non-encrypted with hardlinks, then initiate the first backup to the new location. This is where it failed for me.
Hey, I know this is quite old, but I just had this issue too (v7.4.3), and I think I know what the issue is.
So the Backup type is 'Filesystem (Mountpoint). Cloudron tries to hardlink between one device (primary boot, or one particular mountpoint) and the other (another mountpoint). Hardlinking isn't supported between devices sometimes though, so the hardlink fails.
This issue seems to occur even with encryption though.
Just a heads up in case anybody runs into this issue.
Solution in the main time is to just not use hardlinks.