Hi, I hope you can help. I have read the ATI manual and all the forum posts on backup locations thoroughly; I am an IT consultant and am quite certain that I have created the backup location and scheduled jobs correctly, yet old backups are not getting deleted - ATI (4942) tries to delete them, but fails with the error "Archive is invalid or its type is unsupported." The archives **_ARE_** valid, proven by ATI Validation succeeding and the fact that I have successfully restored them - once for test purposes, once after my primary HDD failed. I run a simple backup scenario: full disk images only, no incrementals or differentials, and only one quota (number of backups). I run Windows XP SP2. I am backing up to a 2nd internal hard drive. I ran CHKDSK /R on the 2nd hard drive and there were no errors. Here is what I have tried, for both full disk image and single file folder backups (the latter so I can quickly test settings): - delete existing Backup Location - uninstall previous build / reboot / clean install Build 4942 - create Backup Location (only one limit is set: # of Backups = 2) - create Scheduled Task (Full Backups ONLY) - set Task start time to one minute from now, so it runs via schedule - repeat until # of Backups limit is exceeded - oldest archive NOT DELETED! - check log and see ERROR (Archive is invalid or its type is unsupported.) Here is a screenshot of a typical log entry: http://www.pcmentoring.com/images/ScreenShot-ArchiveIsInvalid.jpg WRT uninstall/reinstall, this post refers to a confounded registry. When I uninstalled, I simply used Add/Remove Programs in Control Panel, I did not regedit and manually delete any leftover keys. Might that help? Lastly, I emailed Acronis Support the above info (and supporting files per their Support Request Guidelines) and received an insultingly simple response suggesting I watch this movie -- all it does it show you how to create backup locations and set quotas, which I have already done properly, and re-done, and re-done...!! It's as if they did not read my email, just saw the subject and replied with a standardized, baby-formula "solution". Useless! Thanks for any help!