I am trying to find a suitable backup-strategy. On windows I used Drive Snapshot (drivesnapshot.de/en/), a killer-app that would send a snapshot of a drive's partition to a network share. The partition could be mounted when snapshotting, and changes to the drive made while snapshotting were not transferred, so the snapshot would be totally consistent.

My ambition is to backup to a nfs-drive, and support for incremental backups would be nice. Exclusions list is also desired but I could do without.

So far, I have tried:
1. Simple Backup (cannot post url, but i can post: sourceforge.net/projects/sbackup)
2. Partimage
3. Bacula

But the problems encountered were:
1. Ends up with unexpected ends of archives...
2. Cannot backup mounted partitions
3. Too complicated...

Drive Snapshot on Linux or similar would be optimal, but I could just as well manage with a grub-option "Backup all partitions to an nfs-drive and then reboot" with underlying scripts.

Do you have any recommendations?

The power backup tool in linux is "tar".
You can use this to make an archived snapshot of any or all the linux filesystem to anywhere. Supports incremental backups et al. You don't need to reboot.

The drawback is you have to write the script for exactly what you want, and get cron to run it at the right times.

Probably the thing you are looking for is called "rsync".