Hello. I use CyberLink PowerBackup to backup my Windows 7, 64, PC. I haven't backed up my PC in about 18 months (I know unacceptable). When I tried to backup last night and this morning, using medium compression, after about 2 hours and 15 percent, I received an error "backup failed". It said that it was unable to write a file "backup file name". I have enough space for backup, and with some compression it should have even more. I have used original backup scheme I created. Can anyone suggest what might be an issue. I am able to write to the drive and while backup is running it can write. The destination is external USB 3 drive, which doesn't have any issues.