@tsukraw It's not your fault, it's a bug (@florent, two bugs) in XO. Backup should fall back to non-NBD and warn there is a network issue, second it should not say delta at the bottom when it's doing a full backup. Known issues, I hit both last month without warnings...
I do hourly CR and I have the full interval set to 168 (once a week). You could set it longer if you have a slow link but backups are reliable. The full backup on CR is more of a data integrity issue. Deltas are just updates to the existing data. If there is a data problem with a delta then the copy is no longer 100% correct. The full backup (assuming it makes it over to the other site) ensures a full fresh copy without relying on past deltas being correct.
If you do CR nightly then setting full to 30 would be once a month. It would be nice to have a skew option to have full backups automatically done on some VMs but not all at the same time.
