Can Veeam "Copy Job" handle alternating destinations?

Solution 1:

I can't test this constellation right now, but what should work:

1. Configure a DNS entry that points to all three NAS:

   thenas -> thenas01,thenas02,thenas03
   

   (Alternatively: give all three NAS the same IP/DNS configuration and make sure you only have one connected at a time.)

2. Configure thenas as a backup Repository.
   Under Repository-> Advanced... tick This repository is backed by rotated hard drives.

3. Configure the backup job with thenas as the target

That way the backup job should only see one target and missing backup files should not be a problem.

More information on Backup Repositories with rotated hard drives.

Solution 2:

Yes. You have to create the repository with the This repository is backed up by rotated hard drives advanced option. Note that this will do a full backup for each NAS which doesn't have the current .vbk full backup file, so you will get 3 full backups per cycle, rather than one, and that your retention policy will count across all of the NAS's, so if you choose to retain 14 backups, it will be the 14 across all 3 of them (= 14 days if you do daily backups), rather than 14 on each (= 3 x 14 = 42 days if you do daily backups).

See Backup Repositories with Rotated Drives | Veeam Backup Guide for full details.