Offline Backup

Offline Backup is a small Windows tray app that copies the folders you choose onto USB drives you keep unplugged, so ransomware, a failed disk or a mistake on your PC can't reach them. Each drive knows which folders it backs up. Before anything changes on a drive you see a preview of what will be added, updated, moved or deleted. Files about to be overwritten or deleted are kept in a _versions folder first, moved and renamed files are moved on the drive instead of copied again, and CRC32/MD5 checksums (with ExactFile-style .md5 files) let you verify a drive at any time - even on another PC. Works with encrypted VeraCrypt volumes. Free and open source (MIT), built with Lazarus/Free Pascal and Delphi.

Features

Preview before every copy: files to add, update, move and delete
Each USB drive knows which folders it backs up
Moved and renamed files are moved on the drive, not copied again
Old versions kept in _versions before anything is overwritten or deleted
CRC32 and MD5 checksums, Verify drive, ExactFile-style .md5 files
Safety check before unusually large changes
Works with VeraCrypt encrypted volumes
Portable: one exe, settings stored next to it

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