Hi @g3uiss , if you have set a retention of 7 days, then you will have restore points during the last 7 days. If you have scheduled a synthetic backup on Saturday : then the full will run at Saturday and no other day. If for some reason the machines are not active on Saturday, the full will not run. The schedule of the day for the synthetic full is fixed to that day!
If a full never happens, you will have a forever forward incremental chain, a new backup chain will never occur which is not recommended as a primary backup job.
More information regarding retention : Short-Term Retention Policy - Veeam Backup Guide for vSphere
More information regarding synthetic full : How Synthetic Full Backup Works - Veeam Backup Guide for vSphere