Veeam is not a direct replacement Backup Exec to tape, but I think it can potentially be a very good option with some minor redesign:
Photogregor wrote:1. Is there a Veeam product that is capable to perform a disaster recovery for the host and/or(!) for the guest systems in case of hard- or software crash?
While Veeam cannot recover the host system, it can of course recover the guest systems, and can do so instantly from backups or via full restore of the VM.
Photogregor wrote:2. Can I restore a single email or a complete email folder back into mail store?
Yes, Exchange Item Level recovery are built right into the product. To restore directly to the mail store requires the Enterprise level license, but all versions can recover individual items, either by saving to a file or emailing the recovered item to a user.
Photogregor wrote:3. Can I restore single files or folders, accidentially deleted by a user?
Yes, all versions of Backup and Replication support recovery of individual files and folders from a VM backup.
Photogregor wrote:4. Is there one product to achieve this within one backup job or do I need different modules?
It's all one product, although there are some license levels that provide various additional capabilities such as restoring directly to the mail store. These are well described on the Veeam website.
Photogregor wrote:5. Can I safe all these data to and restore from tape drive with Veeam without having to think about an additional disk subsystem only for the purpose of backing up (no stuff like B2D2T)?
Veeam is a D2D backup product so, as such, requires the backups to be stored to disk, and then they can be moved to tape, however, an alternative approach is to replace tape completely with a cartridge based disk solution such as the RDX models which are quite popular. Using these in concert with the enhanced support for rotated media in V7 Patch 3 can provide a very similar experience to direct to tape backup, but using disk technology instead.