I use a low-cost commercial product called "
Oops backup".
It has a simple GUI, schedule facility, can be maintained without admin rights, is able to backup open files (which things like robocopy can't - if you have an open file, such as a word document or a mailspool, robocopy will skip it), uses an 'rsync' type function to only backup changes (including only changes in large files)
It keeps the latest backup as a simple directory tree with uncompressed files, fully accessible to the user. Older snapshots are stored as compressed patch files (which convert the current version into the old version - this is the opposite of how most backup systems work. They store the old version, and then store patches to bring it up to date). It has a nice "time-machine" like GUI for restoring old versions of files.
It's coped with me disconnecting LAN, etc. during backups, and it never corrupts anything - the backup may be incomplete, but it will retry as soon as the LAN comes back up. It doesn't interfere with shutdown/restart/log off during a backup - the backup will be stopped, and the system shutsdown instantly.
My only gripe is that it doesn't recognise iSCSI pools as remote drives, it treats them as internal hard drives, and puts big red warnings all over it (saying, this is an internal drive and does not provide optimal safety for your backup files). Still works fine though.