Can you give me a quick run-down of Impression's features and capabilities?
Yes, here you go:
Full, incremental and differential backups.
Back up files and folders to restorable, pax-based archives ('imps') or to plain, Finder-readable file archives.
Back up to CD-R, CD-RW, DVD-R, DVD-RW and disk images on any mounted hard disk (i.e. - iPod, FireWire drive, Network server, etc.)
Multi-session disc burning offers 'write until full' capabilities for supported optical disc formats to reduce disc waste when running multiple small or incremental backups.
Encrypt disk images with AES-128 disk encryption and keep your passwords stored safely in the OS X Keychain.
Compress disk images for local archive storage.
MD5 file checksum validation to ensure accuracy of data operations.
Segment large files between two optical discs, or optionally disable this feature to produce plain readable file-copy archives.
'Root' user runtime authority to avoid permissions issues.